diff --git a/src/Dodge/Data/Room.hs b/src/Dodge/Data/Room.hs
index a7170279e..924557c8b 100644
--- a/src/Dodge/Data/Room.hs
+++ b/src/Dodge/Data/Room.hs
@@ -16,7 +16,7 @@ data RoomPos = RoomPos
     , _rpDir :: Float
     , _rpType :: S.Set RoomPosType
     , _rpLinkStatus :: RPLinkStatus
-    , _rpPlacementUse :: Int
+    , _rpPlacementUse :: S.Set UsedPos
     }
     deriving (Eq, Ord, Show)
 
@@ -80,6 +80,7 @@ data UsedPos
     = UsedPosLow
     | UsedPosMid
     | UsedPosHigh
+    | UsedPosFloor
     deriving (Eq, Ord, Show)
 
 makeLenses ''RoomLink
diff --git a/src/Dodge/PlacementSpot.hs b/src/Dodge/PlacementSpot.hs
index 8d666c2d2..31ec3835b 100644
--- a/src/Dodge/PlacementSpot.hs
+++ b/src/Dodge/PlacementSpot.hs
@@ -61,17 +61,17 @@ randDirPS ps = do
 
 isUnusedLnk :: RoomPos -> Room -> Bool
 isUnusedLnk rp _ = case _rpLinkStatus rp of
-    UnusedLink{} -> _rpPlacementUse rp == 0
+    UnusedLink{} -> null $ _rpPlacementUse rp
     _ -> False
 
 anyUnusedSpot :: PlacementSpot
-anyUnusedSpot = rprBool $ \rp _ -> _rpLinkStatus rp == NotLink && _rpPlacementUse rp == 0
+anyUnusedSpot = rprBool $ \rp _ -> _rpLinkStatus rp == NotLink && null (_rpPlacementUse rp)
 
 psposAddLabel :: RoomPosType -> PlacementSpot -> PlacementSpot
 psposAddLabel lab = psSelect %~ (\f rp r -> f rp r & _Just . _2 . rpType %~ S.insert lab)
 
 rprBool :: (RoomPos -> Room -> Bool) -> PlacementSpot
-rprBool t = PSPos (useRoomPosRoomCond t) (const id) Nothing
+rprBool t = PSPos (useRoomPosRoomCond (S.singleton UsedPosLow) t) (const id) Nothing
 
 rpIsOnPath :: RoomPos -> Bool
 rpIsOnPath = any f . _rpType
@@ -99,34 +99,34 @@ rpOnPathFromEdge pe = any f . _rpType
 resetPLUse :: PlacementSpot -> PlacementSpot
 resetPLUse (PSPos f g fallback) = PSPos f' g fallback
   where
-    f' rp = fmap (second (rpPlacementUse .~ 0)) . f rp
+    f' rp = fmap (second (rpPlacementUse .~ mempty)) . f rp
 resetPLUse _ = error "Tried to reset _rpPlacementUse of non PSPos placement"
 
 rprShift ::
-    (RoomPos -> Room -> Maybe (Point2, Float)) ->
+    (RoomPos -> Room -> Maybe ((Point2, Float), S.Set UsedPos)) ->
     PlacementSpot
 rprShift t = PSPos f (const id) Nothing
   where
     f rp r = case t rp r of
-        Just (p, a) -> Just (PS p a, rp & rpPlacementUse +~ 1)
+        Just ((p, a), xs) -> Just (PS p a, rp & rpPlacementUse <>~ xs)
         Nothing -> Nothing
 
 rprBoolShift ::
     (RoomPos -> Room -> Bool) ->
-    ((Point2, Float) -> (Point2, Float)) ->
+    ((Point2, Float) -> ((Point2, Float), S.Set UsedPos)) ->
     PlacementSpot
 rprBoolShift t shift = PSPos f (const id) Nothing
   where
     f rp r
-        | t rp r = Just (PS p a, rp & rpPlacementUse +~ 1)
+        | t rp r = Just (PS p a, rp & rpPlacementUse <>~ xs)
         | otherwise = Nothing
       where
-        (p, a) = shift (_rpPos rp, _rpDir rp)
+        ((p, a), xs) = shift (_rpPos rp, _rpDir rp)
 
 unusedSpotAwayFromLink :: Float -> PlacementSpot
 unusedSpotAwayFromLink x = rprBool $ \rp r ->
     _rpLinkStatus rp == NotLink
-        && _rpPlacementUse rp == 0
+        && null (_rpPlacementUse rp)
         && all ((> x) . dist (_rpPos rp)) (usedRoomLinkPoss r)
 
 setFallback :: Placement -> Placement -> Placement
@@ -137,14 +137,14 @@ setFallback fallback =
 
 unusedOffPathAwayFromLink :: Float -> PlacementSpot
 unusedOffPathAwayFromLink x = rprBool $ \rp r ->
-    _rpPlacementUse rp == 0
+    null (_rpPlacementUse rp)
         && all ((> x) . dist (_rpPos rp)) (usedRoomLinkPoss r)
         && rpIsOffPath rp
 
 unusedSpotAwayFromInLink :: Float -> PlacementSpot
 unusedSpotAwayFromInLink x = rprBool $ \rp r ->
     _rpLinkStatus rp == NotLink
-        && _rpPlacementUse rp == 0
+        && null (_rpPlacementUse rp)
         && all ((> x) . dist (_rpPos rp)) (usedRoomInLinkPoss r)
 
 --twoUnusedLinks :: (PlacementSpot -> PlacementSpot -> Placement) -> Placement
@@ -167,12 +167,12 @@ twoRoomPoss cond1 cond2 f = Placement (rprBool cond1) PutNothing Nothing Nothing
 
 isInLnk :: RoomPos -> Bool
 isInLnk rp = case _rpLinkStatus rp of
-    UsedInLink{} -> _rpPlacementUse rp == 0
+    UsedInLink{} -> null $ _rpPlacementUse rp
     _ -> False
 
 isOutLnk :: RoomPos -> Bool
 isOutLnk rp = case _rpLinkStatus rp of
-    UsedOutLink{} -> _rpPlacementUse rp == 0
+    UsedOutLink{} -> null $ _rpPlacementUse rp
     _ -> False
 
 useUnusedLnk :: PlacementSpot
@@ -180,27 +180,30 @@ useUnusedLnk = rprBool isUnusedLnk
 
 isUsedLnkUnplaced :: RoomPos -> Bool
 isUsedLnkUnplaced rp = case _rpLinkStatus rp of
-    UsedOutLink{} -> _rpPlacementUse rp == 0
-    UsedInLink{} -> _rpPlacementUse rp == 0
+    UsedOutLink{} -> null (_rpPlacementUse rp)
+    UsedInLink{} -> null (_rpPlacementUse rp)
     _ -> False
 
 useRoomPosCond :: (RoomPos -> Room -> Bool) -> RoomPos -> Room -> Maybe (PlacementSpot, RoomPos)
-useRoomPosCond f = useRoomPosRoomCond $ \rp r -> f rp r
+useRoomPosCond f = useRoomPosRoomCond (S.singleton UsedPosLow) $ \rp r -> f rp r
 
-useRoomPosRoomCond :: (RoomPos -> Room -> Bool) -> RoomPos -> Room -> Maybe (PlacementSpot, RoomPos)
-useRoomPosRoomCond t rp r
-    | t rp r = Just (PS (_rpPos rp) (_rpDir rp), rp & rpPlacementUse +~ 1)
+useRoomPosRoomCond :: S.Set UsedPos 
+    -> (RoomPos -> Room -> Bool) -> RoomPos -> Room 
+    -> Maybe (PlacementSpot, RoomPos)
+useRoomPosRoomCond xs t rp r
+    | t rp r = Just (PS (_rpPos rp) (_rpDir rp), rp & rpPlacementUse <>~ xs)
     | otherwise = Nothing
 
 isUnusedLnkType :: RoomLinkType -> RoomPos -> Room -> Bool
 isUnusedLnkType rlt rp _ = case _rpLinkStatus rp of
-    UnusedLink{_rplsType = rlts} -> rlt `S.member` rlts && _rpPlacementUse rp == 0
+    UnusedLink{_rplsType = rlts} -> rlt `S.member` rlts 
+        && null (_rpPlacementUse rp)
     _ -> False
 
 unusedSpotNearInLink :: Float -> PlacementSpot
 unusedSpotNearInLink x = rprBool $ \rp r ->
     _rpLinkStatus rp == NotLink
-        && _rpPlacementUse rp == 0
+        && null (_rpPlacementUse rp)
         && any ((< x) . dist (_rpPos rp)) (usedRoomInLinkPoss r)
 
 usedRoomInLinkPoss :: Room -> [Point2]
@@ -224,7 +227,8 @@ atFstLnkOut = atNthLinkOut 0
 atNthLinkOut :: Int -> PlacementSpot
 atNthLinkOut n = rprBool $ \rp _ -> rp ^? rpLinkStatus . rplsChildNum == Just n
 
-atNthLnkOutShiftBy :: Int -> ((Point2, Float) -> (Point2, Float)) -> PlacementSpot
+atNthLnkOutShiftBy :: Int -> ((Point2, Float) -> ((Point2, Float),S.Set UsedPos)) 
+    -> PlacementSpot
 atNthLnkOutShiftBy n = rprBoolShift $
     \rp _ -> rp ^? rpLinkStatus . rplsChildNum == Just n
 
@@ -237,7 +241,7 @@ atNthLnkOutShiftBy n = rprBoolShift $
 --      where
 --        (p,a) = theshift (_rpPos rp,_rpDir rp)
 
-atFstLnkOutShiftBy :: ((Point2, Float) -> (Point2, Float)) -> PlacementSpot
+atFstLnkOutShiftBy :: ((Point2, Float) -> ((Point2, Float), S.Set UsedPos)) -> PlacementSpot
 atFstLnkOutShiftBy = atNthLnkOutShiftBy 0
 
 atFstLnkOutShiftInward :: Float -> PlacementSpot
@@ -245,7 +249,7 @@ atFstLnkOutShiftInward = atNthLnkOutShiftInward 0
 
 atNthLnkOutShiftInward :: Int -> Float -> PlacementSpot
 atNthLnkOutShiftInward n x = atNthLnkOutShiftBy n $
-    \(p, a) -> (p +.+ rotateV a (V2 0 (negate x)), a)
+    \(p, a) -> ((p +.+ rotateV a (V2 0 (negate x)), a), S.singleton UsedPosLow)
 
 shiftInBy :: Float -> (Point2, Float) -> (Point2, Float)
 shiftInBy x (p, a) = (p +.+ rotateV a (V2 0 (negate x)), a)
@@ -255,9 +259,9 @@ shiftByV2 x (p, a) = (p +.+ rotateV a x, a)
 
 -- this should probably check the placement use, but so should others: should
 -- unify these
-useLnkRoomPos :: RoomPos -> Room -> Maybe (PlacementSpot, RoomPos)
-useLnkRoomPos rp _ = case _rpLinkStatus rp of
-    UnusedLink{} -> Just (PS (_rpPos rp) (_rpDir rp), rp & rpPlacementUse +~ 1)
+useLnkRoomPos :: S.Set UsedPos -> RoomPos -> Room -> Maybe (PlacementSpot, RoomPos)
+useLnkRoomPos xs rp _ = case _rpLinkStatus rp of
+    UnusedLink{} -> Just (PS (_rpPos rp) (_rpDir rp), rp & rpPlacementUse <>~ xs)
     _ -> Nothing
 
 psRandRanges :: (Float, Float) -> (Float, Float) -> (Float, Float) -> State StdGen (Point2, Float)
diff --git a/src/Dodge/Room/LasTurret.hs b/src/Dodge/Room/LasTurret.hs
index 73d583439..65286aadb 100644
--- a/src/Dodge/Room/LasTurret.hs
+++ b/src/Dodge/Room/LasTurret.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE TupleSections #-}
 module Dodge.Room.LasTurret where
 
 --import Dodge.Item.Held.Cane
@@ -27,7 +28,7 @@ cenLasTur = do
     roomNgon 8 200 <&> rmPmnts
         .~ [ putLasTurret 0.02
            , heightWallPS
-                (resetPLUse $ rprBoolShift (const . isInLnk) (shiftInBy 100))
+                (resetPLUse $ rprBoolShift (const . isInLnk) (shiftInBy 100 <&> (,S.singleton UsedPosLow)))
                 30
                 covershape
            , thelight
@@ -60,7 +61,7 @@ lightSensByDoor i rm =
     --        & rmOutPmnt . at i ?~ sensAboveDoor LaserSensor 20 (atFstLnkOutShiftBy sensorshift)
 
     covershape = rectNSWE 10 (-10) (-20) 20
-    sensorshift (p, a) = (p +.+ rotateV a (V2 60 (-20)), a)
+    sensorshift (p, a) = ((p +.+ rotateV a (V2 60 (-20)), a),S.singleton UsedPosLow)
 
 keyCardRoomRunPast :: RandomGen g => Int -> Int -> State g (MetaTree Room String)
 keyCardRoomRunPast keyid rmid = do
@@ -87,12 +88,13 @@ analyserByNthLink n proxreq i rm =
             .++~ [ psPt (atNthLinkOut n) $ PutForeground $ verticalWire (V2 20 0) 0 80
                  , analyser
                     (SensorWithRequirement proxreq)
-                    (atNthLnkOutShiftBy n (\(p, a) -> (p +.+ rotateV a (V2 18.5 (-2.5)), a)))
+                    (atNthLnkOutShiftBy n (\(p, a) -> 
+                        ((p +.+ rotateV a (V2 18.5 (-2.5)), a), S.singleton UsedPosLow)))
                     (atNthLnkOutShiftBy n sensorshift)
                     & plExternalID ?~ i
                  ]
   where
-    sensorshift (p, a) = (p +.+ rotateV a (V2 (-30) (-10)), a)
+    sensorshift (p, a) = ((p +.+ rotateV a (V2 (-30) (-10)), a), S.singleton UsedPosLow)
 
 analyserByNthLinkWithPrompt ::
     Int -> [TerminalLine] -> ProximityRequirement -> Int -> Placement
@@ -103,12 +105,13 @@ analyserByNthLinkWithPrompt n l proxreq i =
                   analyserWithPrompt
                     l
                     (SensorWithRequirement proxreq)
-                    (atNthLnkOutShiftBy n (\(p, a) -> (p +.+ rotateV a (V2 18.5 (-2.5)), a)))
+                    (atNthLnkOutShiftBy n (\(p, a) -> 
+                        ((p +.+ rotateV a (V2 18.5 (-2.5)), a),S.singleton UsedPosLow)))
                     (atNthLnkOutShiftBy n sensorshift)
                     & plExternalID ?~ i
 --                 ]
   where
-    sensorshift (p, a) = (p +.+ rotateV a (V2 (-30) (-10)), a)
+    sensorshift (p, a) = ((p +.+ rotateV a (V2 (-30) (-10)), a), S.singleton UsedPosLow)
 
 analyserByDoor :: ProximityRequirement -> Int -> Room -> Room
 analyserByDoor = analyserByNthLink 0
diff --git a/src/Dodge/Room/LongDoor.hs b/src/Dodge/Room/LongDoor.hs
index 8578b57b7..68177ee61 100644
--- a/src/Dodge/Room/LongDoor.hs
+++ b/src/Dodge/Room/LongDoor.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE TupleSections #-}
 -- | Rooms containing long doors, probably with a big reveal behind them.
 module Dodge.Room.LongDoor where
 
@@ -105,7 +106,8 @@ addButtonSlowDoor x h rm = do
   where
     theterminal =
         putMessageTerminal terminalColor (simpleTermMessage themessage)
-            & plSpot .~ rprBoolShift (isUnusedLnkType InLink) (shiftByV2 (V2 0 (-10)))
+            & plSpot .~ rprBoolShift (isUnusedLnkType InLink) 
+                (shiftByV2 (V2 0 (-10)) <&> (,S.singleton UsedPosLow))
     themessage =
         [ "WARNING:"
         , "LARGE BIOMASS DETECTED"
diff --git a/src/Dodge/Room/Pillar.hs b/src/Dodge/Room/Pillar.hs
index 1420ca84f..8da0bde7f 100644
--- a/src/Dodge/Room/Pillar.hs
+++ b/src/Dodge/Room/Pillar.hs
@@ -87,7 +87,7 @@ roomPillarsSquare = do
             ++ concatMap (replicate nlns . makepill) [East, West]
   where
     makepill edge = sps (rprBool $ \rp _ -> t edge rp) smallPillar
-    t edge rp = any (f edge) (_rpType rp) && _rpPlacementUse rp == 0
+    t edge rp = any (f edge) (_rpType rp) && null (_rpPlacementUse rp)
     f edge rpt = maybe False (PathFromEdge edge 0 `S.member`) (rpt ^? offPathFromEdges)
 
 roomPillarsPassage :: RandomGen g => State g Room
@@ -114,7 +114,7 @@ roomPillars pillarsize w h wn hn = do
                     .~ rprBool
                         ( \rp _ ->
                             rpIsOffPath rp
-                                && _rpPlacementUse rp == 0
+                                && null (_rpPlacementUse rp)
                                 && _rpLinkStatus rp == NotLink
                         )
                 )
diff --git a/src/Dodge/Room/Procedural.hs b/src/Dodge/Room/Procedural.hs
index e4b0b0027..9e7558823 100644
--- a/src/Dodge/Room/Procedural.hs
+++ b/src/Dodge/Room/Procedural.hs
@@ -96,7 +96,8 @@ roomRect x y xn yn =
         zipWith (lnkBothAnd (OnEdge edge) edgefrom1 edgefrom2) [0 ..]
             . zipCountDown
     pth = linksAndPath' lnks $ map (bimap (+.+ V2 20 20) (+.+ V2 20 20)) (makeGrid xd xn yd yn)
-    makeonpos (p, a) = RoomPos p 0 (S.singleton $ RoomPosOnPath $ makerpedges a) NotLink 0
+    makeonpos (p, a) = RoomPos p 0 (S.singleton $ RoomPosOnPath $ makerpedges a) 
+        NotLink mempty
     makerpedges (a, b) =
         S.fromList
             [ PathFromEdge South b
@@ -106,7 +107,8 @@ roomRect x y xn yn =
             ]
     posps' = map (over _1 (+.+ V2 20 20)) $ gridPoints'' xd (xn + 1) yd (yn + 1)
     interposps' = map (over _1 (+.+ V2 (20 + xd / 2) (20 + yd / 2))) $ gridPoints'' xd xn yd yn
-    makeoffpos (p, a) = RoomPos p 0 (S.singleton $ RoomPosOffPath $ makerpedges' a) NotLink 0
+    makeoffpos (p, a) = RoomPos 
+        p 0 (S.singleton $ RoomPosOffPath $ makerpedges' a) NotLink mempty
     makerpedges' (a, b) =
         S.fromList
             [ PathFromEdge South b
@@ -203,8 +205,8 @@ quarterRoomTri w = do
                     ]
             , _rmPmnts = b ++ [mntLS iShape (V2 (w -20) w) (V3 (w -20) (w -20) 70)]
             , _rmPos =
-                [ RoomPos (V2 (w -20) (w -20)) pi S.empty NotLink 0
-                , RoomPos (V2 (w -15) (w -25)) pi S.empty NotLink 0
+                [ RoomPos (V2 (w -20) (w -20)) pi S.empty NotLink mempty
+                , RoomPos (V2 (w -15) (w -25)) pi S.empty NotLink mempty
                 ]
             , _rmBound = [[V2 0 0, V2 w w, V2 (- w) w]]
             }
@@ -252,7 +254,7 @@ quarterRoomSquare w = do
                     ]
             , _rmPmnts = b ++ [blockLine (V2 (w / 2) (w / 2)) (V2 0 w)]
             , _rmPos =
-                [ RoomPos p pi S.empty NotLink 0
+                [ RoomPos p pi S.empty NotLink mempty
                 | p <- [V2 20 (2 * w -40), V2 25 (2 * w -45)]
                 ]
             , --, _rmBound = [map toV2 [(w,w),(0,2*w),(-w,w)]]
diff --git a/src/Dodge/Room/Room.hs b/src/Dodge/Room/Room.hs
index a9c0b3e74..6e27908db 100644
--- a/src/Dodge/Room/Room.hs
+++ b/src/Dodge/Room/Room.hs
@@ -201,7 +201,7 @@ weaponBetweenPillars = do
     let wpPos = rprBool $ \rp r ->
             and
                 [ rpIsOnPath rp
-                , _rpPlacementUse rp == 0
+                , null $ _rpPlacementUse rp
                 , _rpLinkStatus rp == NotLink
                 , any ((< 100) . dist (_rpPos rp)) (usedRoomInLinkPoss r)
                 ]
@@ -211,7 +211,7 @@ weaponBetweenPillars = do
         randDirPS $
             rprBool $ \rp r ->
                 rpIsOnPath rp
-                    && _rpPlacementUse rp == 0
+                    && null (_rpPlacementUse rp)
                     && all ((> 100) . dist (_rpPos rp)) (usedRoomLinkPoss r)
     ( roomPillars 30 w h wn hn
             <&> rmPmnts .++~ map (`sps` randC1) critPlacementSpots ++ [sps wpPos (PutFlIt wp)]
@@ -329,7 +329,7 @@ pistolerRoom = do
         .++~ replicate
             3
             ( psPtPl
-                (rprBool $ \rp _ -> _rpPlacementUse rp == 0 && rpIsOnPath rp)
+                (rprBool $ \rp _ -> null (_rpPlacementUse rp) && rpIsOnPath rp)
                 (PutCrit chaseCrit)
             )
 
@@ -369,7 +369,7 @@ spawnerRoom = do
         roomC x y <&> rmPmnts
             .:~ psPtPl
                 ( rprBool $ \rp _ ->
-                    _rpPlacementUse rp == 0 && rpIsOnPath rp
+                    null (_rpPlacementUse rp) && rpIsOnPath rp
                         && xV2 (_rpPos rp) < x / 2
                         && yV2 (_rpPos rp) < y / 2
                 )
diff --git a/src/Dodge/Room/SensorDoor.hs b/src/Dodge/Room/SensorDoor.hs
index f36df9abd..1e5c09df7 100644
--- a/src/Dodge/Room/SensorDoor.hs
+++ b/src/Dodge/Room/SensorDoor.hs
@@ -1,4 +1,4 @@
---{-# LANGUAGE TupleSections #-}
+{-# LANGUAGE TupleSections #-}
 module Dodge.Room.SensorDoor (sensAboveDoor,sensorRoomRunPast) where
 
 import Dodge.Data.MTRS
@@ -53,7 +53,7 @@ sensorRoomRunPast dt n = do
 sensAboveDoor :: SensorType -> Float -> PlacementSpot -> Placement
 sensAboveDoor sensetype wth ps =
     extTrigLitPos
-        (atFstLnkOutShiftBy (\(p, a) -> (p +.+ rotateV a (V2 18.5 (-2.5)), a)))
+        (atFstLnkOutShiftBy (\(p, a) -> ((p +.+ rotateV a (V2 18.5 (-2.5)), a), S.singleton UsedPosHigh)))
         (\tp -> Just $ damageSensor sensetype wth (_plMID tp) ps)
 
 sensInsideDoor :: SensorType -> Int -> Room -> Room
@@ -65,7 +65,7 @@ sensInsideDoor senseType i rm = rm
              , psPt atFstLnkOut . PutForeground $ verticalWire (V2 20 0) 0 80
              , putMessageTerminal terminalColor 
                 (textTerminal & tmCommands .:~ TCDamageCommand)
-                & plSpot .~ rprBoolShift isUnusedLnk (shiftInBy 10)
+                & plSpot .~ rprBoolShift isUnusedLnk (shiftInBy 10 <&> (, S.singleton UsedPosHigh))
             , sensAboveDoor senseType 10 (atFstLnkOutShiftInward 100) & plExternalID ?~ i
              ]
 --    & rmOutPmnt . at i ?~ sensAboveDoor senseType 10 (atFstLnkOutShiftInward 100)
diff --git a/src/Dodge/Room/Tanks.hs b/src/Dodge/Room/Tanks.hs
index f269e7c76..3412e4de8 100644
--- a/src/Dodge/Room/Tanks.hs
+++ b/src/Dodge/Room/Tanks.hs
@@ -56,7 +56,7 @@ randEdgeTank = do
             & plSpot
                 .~ rprBool
                     ( \rp _ ->
-                        _rpPlacementUse rp == 0
+                        null (_rpPlacementUse rp)
                             && rpOffPathFromEdge (PathFromEdge edge 0) rp
                     )
 
@@ -85,7 +85,7 @@ randEdgeTanks i = do
                 & plSpot
                     .~ rprBool
                         ( \rp _ ->
-                            _rpPlacementUse rp == 0
+                            null (_rpPlacementUse rp)
                                 && rpOffPathFromEdge (PathFromEdge edge 0) rp
                         )
 
diff --git a/src/Dodge/Room/Tutorial.hs b/src/Dodge/Room/Tutorial.hs
index af1165ae1..928799d24 100644
--- a/src/Dodge/Room/Tutorial.hs
+++ b/src/Dodge/Room/Tutorial.hs
@@ -1,5 +1,6 @@
 module Dodge.Room.Tutorial where
 
+import qualified Data.Set as S
 import ShortShow
 import Dodge.Data.MTRS
 import Dodge.Room.Room
@@ -86,7 +87,7 @@ tutDrop = do
             terminalColor
             (defaultTerminal & tmBootLines .~ ss <> tlSetStatus (TerminalPressTo $ show x <>"QUIT") <> tlDoEffect TmWdWdPowerDownTerminal)
             & plSpot .~ rprBoolShift isUnusedLnk 
-                (\(p, a) -> (p + 10 *.* unitVectorAtAngle (a - pi/2), a))
+                (\(p, a) -> ((p + 10 *.* unitVectorAtAngle (a - pi/2), a), S.singleton UsedPosLow))
     ss =
         [makeTermLine "--------------------------------------------"
         ,makeTermLine "YOU CAN ONLY CARRY A LIMITED AMOUNT OF ITEMS"
@@ -151,7 +152,7 @@ tutHub = do
             terminalColor
             (defaultTerminal & tmBootLines .~ ss' <> tlSetStatus (TerminalPressTo "QUIT") <> tlDoEffect TmWdWdPowerDownTerminal)
             & plSpot .~ rprBoolShift isUnusedLnk 
-                (\(p, a) -> (p + 10 *.* unitVectorAtAngle (a - pi/2), a))
+                (\(p, a) -> ((p + 10 *.* unitVectorAtAngle (a - pi/2), a),S.singleton UsedPosLow))
     ss' =
         [ makeTermLine "---------------------------------------------"
         , makeTermLine "HOLD [CAPS] AND SCROLL"
diff --git a/src/Dodge/Room/Warning.hs b/src/Dodge/Room/Warning.hs
index 6deed3dca..580a5d271 100644
--- a/src/Dodge/Room/Warning.hs
+++ b/src/Dodge/Room/Warning.hs
@@ -1,15 +1,19 @@
 --{-# LANGUAGE TupleSections #-}
-module Dodge.Room.Warning (warningRooms,addDoorToggleTerminal
-    , addDoorAtNthLinkToggleTerminal) where
+module Dodge.Room.Warning (
+    warningRooms,
+    addDoorToggleTerminal,
+    addDoorAtNthLinkToggleTerminal,
+) where
 
-import Control.Monad
-import Dodge.Default.Terminal
-import Dodge.Data.BlBl
 import Color
+import Control.Monad
 import qualified Data.Map.Strict as M
 import Data.Maybe
+import qualified Data.Set as S
 import Dodge.Cleat
+import Dodge.Data.BlBl
 import Dodge.Data.GenWorld
+import Dodge.Default.Terminal
 import Dodge.Placement.Instance
 import Dodge.PlacementSpot
 import Dodge.Room.Door
@@ -34,32 +38,37 @@ addDoorToggleTerminal :: [TerminalLine] -> Int -> Room -> Room
 addDoorToggleTerminal = addDoorAtNthLinkToggleTerminal 0
 
 addDoorAtNthLinkToggleTerminal :: Int -> [TerminalLine] -> Int -> Room -> Room
-addDoorAtNthLinkToggleTerminal j xs i = (rmName .++~ "doorToggle-")
---        . (rmOutPmnt . at i ?~ outplace)
+addDoorAtNthLinkToggleTerminal j xs i =
+    (rmName .++~ "doorToggle-")
+        --        . (rmOutPmnt . at i ?~ outplace)
         . (rmPmnts .:~ outplace)
   where
     outplace =
         extTrigLitPos
-            (atNthLnkOutShiftBy j  (\(p, a) -> (p +.+ rotateV a (V2 18.5 (-2.5)), a)))
-            ( Just . set plSpot (rprShift (moveToSideNthOutLink j))
+            (atNthLnkOutShiftBy j (\(p, a) -> ((p +.+ rotateV a (V2 18.5 (-2.5)), a), S.singleton UsedPosLow)))
+            ( Just . set plSpot (rprShift (moveToSideNthOutLink (S.singleton UsedPosLow) j))
                 . putMessageTerminal terminalColor
                 . termMessages
-            ) & plExternalID ?~ i
+            )
+            & plExternalID
+            ?~ i
     termMessages trpl =
         lineOutputTerminal xs --(makeColorTermLine red "WARNING" : makeTermPara str)
-            & tmToggles .~ M.fromList
+            & tmToggles
+                .~ M.fromList
                     [("DOOR", TerminalToggle (fromJust $ _plMID trpl) (BlConst True))]
 
-
 addWarningTerminal :: String -> Int -> Room -> Room
-addWarningTerminal str = addDoorToggleTerminal 
-    (makeColorTermLine red "WARNING" : makeTermPara str)
+addWarningTerminal str =
+    addDoorToggleTerminal
+        (makeColorTermLine red "WARNING" : makeTermPara str)
 
 lineOutputTerminal :: [TerminalLine] -> Terminal
 lineOutputTerminal tls = defaultTerminal & tmBootLines .~ textInputBlurb tls
 
-moveToSideNthOutLink :: Int -> RoomPos -> Room -> Maybe (Point2, Float)
-moveToSideNthOutLink i rp rm = do
+moveToSideNthOutLink :: S.Set UsedPos
+    -> Int -> RoomPos -> Room -> Maybe ((Point2, Float), S.Set UsedPos)
+moveToSideNthOutLink xs i rp rm = do
     j <- rp ^? rpLinkStatus . rplsChildNum
     guard $ i == j
     let rppos = _rpPos rp
@@ -67,11 +76,12 @@ moveToSideNthOutLink i rp rm = do
         inpos = rppos +.+ rotateV rpdir (V2 0 (-12.5))
         rtpos = inpos +.+ rotateV rpdir (V2 30 0)
         ltpos = inpos +.+ rotateV rpdir (V2 (-30) 0)
-    return $ if any (isJust . intersectSegPolyFirst inpos ltpos) (_rmPolys rm)
+    return $
+        if any (isJust . intersectSegPolyFirst inpos ltpos) (_rmPolys rm)
             then -- the above test may not work properly if the room polys are
             -- complicated, it should really use created walls...
-                 (rtpos, rpdir)
-            else  (ltpos, rpdir)
+                ((rtpos, rpdir), xs)
+            else ((ltpos, rpdir), xs)
 
 --moveToSideFirstOutLink :: RoomPos -> Room -> Maybe (Point2, Float)
 --moveToSideFirstOutLink rp rm = do
diff --git a/src/Dodge/Tree/Shift.hs b/src/Dodge/Tree/Shift.hs
index e0636913a..49c492870 100644
--- a/src/Dodge/Tree/Shift.hs
+++ b/src/Dodge/Tree/Shift.hs
@@ -91,7 +91,7 @@ posRms prs parenti@(parent, _) ((numChild, t@(Node childi _)) : its) tseq = do
                             , _rpDir = snd (lnkPosDir outlnk)
                             , _rpType = S.empty
                             , _rpLinkStatus = UsedOutLink (_rlType outlnk) numChild (snd childi)
-                            , _rpPlacementUse = 0
+                            , _rpPlacementUse = mempty
                             }
                     & rmChildren .:~ snd childi
             shiftedoutlink = shiftLinkBy (_rmShift parent) outlnk
@@ -106,7 +106,7 @@ posRms prs parenti@(parent, _) ((numChild, t@(Node childi _)) : its) tseq = do
                             , _rpDir = snd (lnkPosDir il)
                             , _rpType = S.empty
                             , _rpLinkStatus = UsedInLink (_rlType il) (snd parenti)
-                            , _rpPlacementUse = 0
+                            , _rpPlacementUse = mempty
                             }
             shiftedt =
                 over
@@ -123,7 +123,7 @@ createUnusedLinkPos rm = rm & rmPos .++~ map f (_rmLinks rm)
             , _rpDir = _rlDir rl
             , _rpType = S.empty
             , _rpLinkStatus = UnusedLink $ _rlType rl
-            , _rpPlacementUse = 0
+            , _rpPlacementUse = mempty
             }
 
 zipCount :: [a] -> [(Int, a)]
diff --git a/tags b/tags
index 88ff1afd5..6ba8b2891 100644
--- a/tags
+++ b/tags
@@ -1446,6 +1446,11 @@ UseableWhenAimed	src/Dodge/Data/UseCondition.hs	5;"	C
 UseableWhenHeld	src/Dodge/Data/UseCondition.hs	6;"	C
 UsedInLink	src/Dodge/Data/Room.hs	61;"	C
 UsedOutLink	src/Dodge/Data/Room.hs	56;"	C
+UsedPos	src/Dodge/Data/Room.hs	79;"	t
+UsedPosFloor	src/Dodge/Data/Room.hs	83;"	C
+UsedPosHigh	src/Dodge/Data/Room.hs	82;"	C
+UsedPosLow	src/Dodge/Data/Room.hs	80;"	C
+UsedPosMid	src/Dodge/Data/Room.hs	81;"	C
 VAO	src/Shader/Data.hs	64;"	t
 VBO	src/Shader/Data.hs	81;"	t
 VF	src/Polyhedra/Data.hs	21;"	t
@@ -2552,11 +2557,11 @@ activateDetonator	src/Dodge/Creature/Impulse/UseItem.hs	62;"	f
 activeTargetCursorPic	src/Dodge/Targeting/Draw.hs	31;"	f
 addArmour	src/Dodge/Creature.hs	84;"	f
 addBranchAt	src/Dodge/Tree/GenerateStructure.hs	18;"	f
-addButtonSlowDoor	src/Dodge/Room/LongDoor.hs	97;"	f
+addButtonSlowDoor	src/Dodge/Room/LongDoor.hs	98;"	f
 addCrGibs	src/Dodge/Prop/Gib.hs	16;"	f
 addDepth	src/Picture/Base.hs	133;"	f
-addDoorAtNthLinkToggleTerminal	src/Dodge/Room/Warning.hs	36;"	f
-addDoorToggleTerminal	src/Dodge/Room/Warning.hs	33;"	f
+addDoorAtNthLinkToggleTerminal	src/Dodge/Room/Warning.hs	40;"	f
+addDoorToggleTerminal	src/Dodge/Room/Warning.hs	37;"	f
 addDoorWall	src/Dodge/Placement/PlaceSpot/TriggerDoor.hs	53;"	f
 addEdges	src/Dodge/Path.hs	122;"	f
 addGib4	src/Dodge/Prop/Gib.hs	51;"	f
@@ -2582,10 +2587,10 @@ addPolyWalls	src/Dodge/LevelGen/StaticWalls.hs	129;"	f
 addRandomGirderEW	src/Dodge/Room/Girder.hs	9;"	f
 addRandomGirderFrom	src/Dodge/Room/Girder.hs	16;"	f
 addSideEffect	src/Dodge/Concurrent.hs	29;"	f
-addSouthPillars	src/Dodge/Room/LongDoor.hs	89;"	f
+addSouthPillars	src/Dodge/Room/LongDoor.hs	90;"	f
 addTermSignal	src/Dodge/Event/Input.hs	31;"	f
 addToTrunk	src/TreeHelp.hs	157;"	f
-addWarningTerminal	src/Dodge/Room/Warning.hs	54;"	f
+addWarningTerminal	src/Dodge/Room/Warning.hs	61;"	f
 addZ	src/Geometry/Vector3D.hs	89;"	f
 adjustIMZone	src/Dodge/Base.hs	81;"	f
 advanceScrollAmount	src/Dodge/Update.hs	403;"	f
@@ -2610,10 +2615,10 @@ ammoMagSPic	src/Dodge/Item/Draw/SPic.hs	145;"	f
 amr	src/Dodge/Item/Held/Rod.hs	34;"	f
 anRoom	src/Dodge/Floor.hs	117;"	f
 analyser	src/Dodge/Placement/Instance/Analyser.hs	12;"	f
-analyserByDoor	src/Dodge/Room/LasTurret.hs	113;"	f
-analyserByDoorWithPrompt	src/Dodge/Room/LasTurret.hs	116;"	f
-analyserByNthLink	src/Dodge/Room/LasTurret.hs	83;"	f
-analyserByNthLinkWithPrompt	src/Dodge/Room/LasTurret.hs	97;"	f
+analyserByDoor	src/Dodge/Room/LasTurret.hs	116;"	f
+analyserByDoorWithPrompt	src/Dodge/Room/LasTurret.hs	119;"	f
+analyserByNthLink	src/Dodge/Room/LasTurret.hs	84;"	f
+analyserByNthLinkWithPrompt	src/Dodge/Room/LasTurret.hs	99;"	f
 analyserWithPrompt	src/Dodge/Placement/Instance/Analyser.hs	15;"	f
 andOrRegex	src/Dodge/DisplayInventory.hs	78;"	f
 angleBetween	src/Geometry.hs	161;"	f
@@ -2664,12 +2669,12 @@ arrow	src/Picture/Composite.hs	19;"	f
 arrowPath	src/Picture/Composite.hs	8;"	f
 assignHotkey	src/Dodge/AssignHotkey.hs	9;"	f
 assignPushDoors	src/Dodge/LevelGen.hs	44;"	f
-atFstLnkOut	src/Dodge/PlacementSpot.hs	221;"	f
-atFstLnkOutShiftBy	src/Dodge/PlacementSpot.hs	240;"	f
-atFstLnkOutShiftInward	src/Dodge/PlacementSpot.hs	243;"	f
-atNthLinkOut	src/Dodge/PlacementSpot.hs	224;"	f
-atNthLnkOutShiftBy	src/Dodge/PlacementSpot.hs	227;"	f
-atNthLnkOutShiftInward	src/Dodge/PlacementSpot.hs	246;"	f
+atFstLnkOut	src/Dodge/PlacementSpot.hs	224;"	f
+atFstLnkOutShiftBy	src/Dodge/PlacementSpot.hs	244;"	f
+atFstLnkOutShiftInward	src/Dodge/PlacementSpot.hs	247;"	f
+atNthLinkOut	src/Dodge/PlacementSpot.hs	227;"	f
+atNthLnkOutShiftBy	src/Dodge/PlacementSpot.hs	230;"	f
+atNthLnkOutShiftInward	src/Dodge/PlacementSpot.hs	250;"	f
 attachBranch	src/Dodge/Tree/Compose.hs	83;"	f
 attachInfo	src/Dodge/Item/Info.hs	58;"	f
 attachList	src/Dodge/Tree/Compose.hs	80;"	f
@@ -2811,10 +2816,10 @@ cardList	src/Dodge/Base/CardinalPoint.hs	6;"	f
 cardVec	src/Dodge/Base/CardinalPoint.hs	9;"	f
 cardinalVectors	src/Dodge/FloorItem.hs	24;"	f
 cdtPropagateFold	src/Dodge/DoubleTree.hs	407;"	f
-cenLasTur	src/Dodge/Room/LasTurret.hs	24;"	f
+cenLasTur	src/Dodge/Room/LasTurret.hs	25;"	f
 centerText	src/Picture/Base.hs	184;"	f
 centerVaultExplosiveExit	src/Dodge/Room/NoNeedWeapon.hs	20;"	f
-centerVaultRoom	src/Dodge/Room/Procedural.hs	288;"	f
+centerVaultRoom	src/Dodge/Room/Procedural.hs	290;"	f
 centroid	src/Geometry/Polygon.hs	136;"	f
 centroidNum	src/Geometry/Polygon.hs	139;"	f
 chainCreatureUpdates	src/Dodge/Creature/ChainUpdates.hs	6;"	f
@@ -2870,7 +2875,7 @@ clAlt	src/Dodge/Cloud.hs	5;"	f
 clClSpringVel	src/Dodge/Update.hs	827;"	f
 clColor	src/Shader/Poke/Cloud.hs	35;"	f
 clZoneSize	src/Dodge/Zoning/Cloud.hs	21;"	f
-clampPath	src/Dodge/Room/Procedural.hs	165;"	f
+clampPath	src/Dodge/Room/Procedural.hs	167;"	f
 clang1S	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	560;"	f
 clang2S	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	676;"	f
 clangS	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	542;"	f
@@ -2929,11 +2934,11 @@ combinationsGraph	src/Dodge/Combine/Graph.hs	74;"	f
 combinationsOf	src/Multiset.hs	46;"	f
 combinationsTrie	src/Dodge/Combine.hs	43;"	f
 combineAwareness	src/Dodge/Creature/Perception.hs	110;"	f
-combineFloors	src/Dodge/Room/Procedural.hs	171;"	f
+combineFloors	src/Dodge/Room/Procedural.hs	173;"	f
 combineInventoryExtra	src/Dodge/Render/HUD.hs	337;"	f
 combineItemListYouX	src/Dodge/Combine.hs	35;"	f
 combineList	src/Dodge/Combine.hs	21;"	f
-combineRooms	src/Dodge/Room/Procedural.hs	151;"	f
+combineRooms	src/Dodge/Room/Procedural.hs	153;"	f
 combineS	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	480;"	f
 combineTree	src/Dodge/Tree/Compose.hs	67;"	f
 commandColor	src/Dodge/Terminal.hs	114;"	f
@@ -2963,7 +2968,7 @@ coolMinigun	src/Dodge/Creature/State.hs	94;"	f
 copier	src/Dodge/Item/Scope.hs	88;"	f
 copierItemUpdate	src/Dodge/Creature/State.hs	130;"	f
 copyItemToFloor	src/Dodge/FloorItem.hs	14;"	f
-corDoor	src/Dodge/Room/Room.hs	378;"	f
+corDoor	src/Dodge/Room/Room.hs	380;"	f
 cornerList	src/Preload/Render.hs	198;"	f
 corpseOrGib	src/Dodge/Creature/Update.hs	110;"	f
 corridor	src/Dodge/Room/Corridor.hs	17;"	f
@@ -3035,9 +3040,9 @@ creatureShootPulseLaser	src/Dodge/HeldUse.hs	859;"	f
 creatureTurnTo	src/Dodge/Creature/Impulse/Movement.hs	53;"	f
 creatureTurnToward	src/Dodge/Creature/Impulse/Movement.hs	74;"	f
 creatureTurnTowardDir	src/Dodge/Creature/Impulse/Movement.hs	63;"	f
-critInDeadEnd	src/Dodge/Room/Room.hs	236;"	f
-critsPillarRoom	src/Dodge/Room/Room.hs	383;"	f
-critsRoom	src/Dodge/Room/Room.hs	391;"	f
+critInDeadEnd	src/Dodge/Room/Room.hs	238;"	f
+critsPillarRoom	src/Dodge/Room/Room.hs	385;"	f
+critsRoom	src/Dodge/Room/Room.hs	393;"	f
 crixsNearSeg	src/Dodge/Zoning/Creature.hs	29;"	f
 crossPic	src/Dodge/Render/Label.hs	27;"	f
 crossProd	src/Geometry/Vector3D.hs	41;"	f
@@ -3098,7 +3103,7 @@ dbArgChain	src/Dodge/Base.hs	170;"	f
 dbwMuzzles	src/Dodge/HeldUse.hs	314;"	f
 deZoneIX	src/Dodge/Zoning/Base.hs	89;"	f
 deZoneWall	src/Dodge/Zoning/Wall.hs	70;"	f
-deadEndRoom	src/Dodge/Room/Room.hs	239;"	f
+deadEndRoom	src/Dodge/Room/Room.hs	241;"	f
 deadFeet	src/Dodge/Creature/Picture.hs	68;"	f
 deadRot	src/Dodge/Creature/Picture.hs	84;"	f
 deadScalp	src/Dodge/Creature/Picture.hs	81;"	f
@@ -3311,7 +3316,7 @@ doorMechanism	src/Dodge/DrWdWd.hs	24;"	f
 doorMechanismStepwise	src/Dodge/DrWdWd.hs	59;"	f
 dotV	src/Geometry/Vector.hs	75;"	f
 dotV3	src/Geometry/Vector3D.hs	119;"	f
-doubleCorridorBarrels	src/Dodge/Room/Room.hs	269;"	f
+doubleCorridorBarrels	src/Dodge/Room/Room.hs	271;"	f
 doubleFindMax	src/Dodge/Update/Scroll.hs	181;"	f
 doubleFindMin	src/Dodge/Update/Scroll.hs	160;"	f
 doubleFindPred	src/Dodge/Update/Scroll.hs	188;"	f
@@ -3704,7 +3709,7 @@ glassShat2S	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	618;"	f
 glassShat3S	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	458;"	f
 glassShat4S	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	612;"	f
 glassSwitchBack	src/Dodge/Room/Room.hs	72;"	f
-glassSwitchBackCrits	src/Dodge/Room/Room.hs	101;"	f
+glassSwitchBackCrits	src/Dodge/Room/Room.hs	103;"	f
 glauncherPic	src/Dodge/Item/Draw/SPic.hs	412;"	f
 glushortSize	src/Shader/Parameters.hs	25;"	f
 goToPostStrat	src/Dodge/Creature/Strategy.hs	10;"	f
@@ -3762,8 +3767,8 @@ headLampShape	src/Dodge/Item/Draw/SPic.hs	455;"	f
 headMap	src/Dodge/DoubleTree.hs	249;"	f
 headPQ	src/Dodge/Creature/HandPos.hs	115;"	f
 healS	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	492;"	f
-healthAnalyserByDoor	src/Dodge/Room/LasTurret.hs	80;"	f
-healthTest	src/Dodge/Room/LasTurret.hs	119;"	f
+healthAnalyserByDoor	src/Dodge/Room/LasTurret.hs	81;"	f
+healthTest	src/Dodge/Room/LasTurret.hs	122;"	f
 heightWallPS	src/Dodge/Placement/Instance/Wall.hs	13;"	f
 heldAimStance	src/Dodge/Item/AimStance.hs	24;"	f
 heldAimZoom	src/Dodge/Update/Camera.hs	149;"	f
@@ -3909,7 +3914,7 @@ isPulseLaser	src/Dodge/IsPulseLaser.hs	10;"	f
 isPutID	src/Dodge/Placement/Instance/Wall.hs	129;"	f
 isRHS	src/Geometry/LHS.hs	24;"	f
 isUnusedLnk	src/Dodge/PlacementSpot.hs	62;"	f
-isUnusedLnkType	src/Dodge/PlacementSpot.hs	195;"	f
+isUnusedLnkType	src/Dodge/PlacementSpot.hs	197;"	f
 isUsedLnkUnplaced	src/Dodge/PlacementSpot.hs	181;"	f
 isValidCommand	src/Dodge/Debug/Terminal.hs	134;"	f
 isVowel	src/StringHelp.hs	8;"	f
@@ -3978,8 +3983,8 @@ justify	src/Justify.hs	9;"	f
 k	src/ShortShow.hs	44;"	f
 k'	src/ShortShow.hs	44;"	f
 keyCard	src/Dodge/Item/Held/Utility.hs	20;"	f
-keyCardAnalyserByDoor	src/Dodge/Room/LasTurret.hs	77;"	f
-keyCardRoomRunPast	src/Dodge/Room/LasTurret.hs	65;"	f
+keyCardAnalyserByDoor	src/Dodge/Room/LasTurret.hs	78;"	f
+keyCardRoomRunPast	src/Dodge/Room/LasTurret.hs	66;"	f
 keyCardRunPastRand	src/Dodge/LockAndKey.hs	36;"	f
 keyPic	src/Dodge/Item/Draw/SPic.hs	471;"	f
 keyholeCorridor	src/Dodge/Room/Corridor.hs	39;"	f
@@ -3991,12 +3996,12 @@ lamp	src/Dodge/Creature/Lamp.hs	21;"	f
 lampCover	src/Dodge/Placement/Instance/LightSource/Cover.hs	8;"	f
 lampCoverWhen	src/Dodge/Placement/Instance/LightSource/Cover.hs	19;"	f
 lampCrSPic	src/Dodge/Render/ShapePicture.hs	75;"	f
-lasCenSensEdge	src/Dodge/Room/LasTurret.hs	138;"	f
+lasCenSensEdge	src/Dodge/Room/LasTurret.hs	141;"	f
 lasGunPic	src/Dodge/Item/Draw/SPic.hs	424;"	f
 lasPulseS	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	526;"	f
-lasSensorTurretTest	src/Dodge/Room/LasTurret.hs	131;"	f
-lasTunnel	src/Dodge/Room/LasTurret.hs	150;"	f
-lasTunnelRunPast	src/Dodge/Room/LasTurret.hs	191;"	f
+lasSensorTurretTest	src/Dodge/Room/LasTurret.hs	134;"	f
+lasTunnel	src/Dodge/Room/LasTurret.hs	153;"	f
+lasTunnelRunPast	src/Dodge/Room/LasTurret.hs	194;"	f
 lasTurret	src/Dodge/Placement/Instance/Turret.hs	40;"	f
 laser	src/Dodge/Item/Held/BatteryGuns.hs	34;"	f
 lastMap	src/Dodge/DoubleTree.hs	253;"	f
@@ -4026,8 +4031,8 @@ leftWristPQ	src/Dodge/Creature/HandPos.hs	81;"	f
 legsSPic	src/Dodge/Item/Draw/SPic.hs	480;"	f
 liShape	src/Dodge/Placement/Instance/LightSource.hs	98;"	f
 light	src/Color.hs	104;"	f
-lightSensByDoor	src/Dodge/Room/LasTurret.hs	50;"	f
-lightSensInsideDoor	src/Dodge/Room/LasTurret.hs	38;"	f
+lightSensByDoor	src/Dodge/Room/LasTurret.hs	51;"	f
+lightSensInsideDoor	src/Dodge/Room/LasTurret.hs	39;"	f
 lightSensor	src/Dodge/Placement/Instance/Sensor.hs	42;"	f
 lightsToRender	src/Dodge/Render/Lights.hs	14;"	f
 lightx4	src/Color.hs	145;"	f
@@ -4037,7 +4042,7 @@ lineCol	src/Picture/Base.hs	230;"	f
 lineGeom	src/Dodge/Base.hs	32;"	f
 lineOnScreenCone	src/Dodge/Debug/Picture.hs	59;"	f
 lineOrth	src/Dodge/Creature/Boid.hs	126;"	f
-lineOutputTerminal	src/Dodge/Room/Warning.hs	58;"	f
+lineOutputTerminal	src/Dodge/Room/Warning.hs	66;"	f
 lineSplit	src/Justify.hs	26;"	f
 lineThick	src/Picture/Base.hs	234;"	f
 lineUp	src/Dodge/Creature/Boid.hs	148;"	f
@@ -4051,7 +4056,7 @@ listGuard	src/Dodge/Creature/ReaderUpdate.hs	190;"	f
 listSelectionColorPicture	src/Dodge/DisplayInventory.hs	302;"	f
 litCorridor90	src/Dodge/Room/RoadBlock.hs	26;"	f
 lmt	src/MatrixHelper.hs	43;"	f
-lnkBothAnd	src/Dodge/Room/Procedural.hs	121;"	f
+lnkBothAnd	src/Dodge/Room/Procedural.hs	123;"	f
 lnkMidPosInvSelsCol	src/Dodge/Render/HUD.hs	387;"	f
 lnkPosDir	src/Dodge/RoomLink.hs	97;"	f
 loadDodgeConfig	src/Dodge/Config/Load.hs	9;"	f
@@ -4246,7 +4251,7 @@ miniGunX	src/Dodge/Item/Held/Cane.hs	33;"	f
 miniGunXPict	src/Dodge/Item/Draw/SPic.hs	384;"	f
 miniGunXPictItem	src/Dodge/Item/Draw/SPic.hs	381;"	f
 miniS	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	716;"	f
-miniTree2	src/Dodge/Room/Room.hs	108;"	f
+miniTree2	src/Dodge/Room/Room.hs	110;"	f
 minimumOn	src/FoldlHelp.hs	14;"	f
 mirrorXAxis	src/Geometry/Polygon.hs	49;"	f
 mirrorxz	src/Picture/Base.hs	335;"	f
@@ -4279,7 +4284,7 @@ moveProjectile	src/Dodge/Projectile/Update.hs	260;"	f
 moveRoomBy	src/Dodge/Room/Link.hs	53;"	f
 moveShockwave	src/Dodge/Shockwave/Update.hs	13;"	f
 moveStuckGrenade	src/Dodge/Projectile/Update.hs	246;"	f
-moveToSideNthOutLink	src/Dodge/Room/Warning.hs	61;"	f
+moveToSideNthOutLink	src/Dodge/Room/Warning.hs	69;"	f
 moveWall	src/Dodge/Wall/Move.hs	29;"	f
 moveWallID	src/Dodge/Wall/Move.hs	24;"	f
 moveWallIDToward	src/Dodge/Wall/Move.hs	47;"	f
@@ -4441,7 +4446,7 @@ pincerP'''	src/Dodge/Creature/Boid.hs	75;"	f
 pingPongBetween	src/Render.hs	221;"	f
 pipe	src/Dodge/Item/Craftable.hs	32;"	f
 pistol	src/Dodge/Item/Held/Stick.hs	40;"	f
-pistolerRoom	src/Dodge/Room/Room.hs	323;"	f
+pistolerRoom	src/Dodge/Room/Room.hs	325;"	f
 pjRemoteSetDirection	src/Dodge/Projectile/Update.hs	225;"	f
 plBlock	src/Dodge/Placement/PlaceSpot/Block.hs	18;"	f
 plDoor	src/Dodge/Placement/PlaceSpot/TriggerDoor.hs	22;"	f
@@ -4602,7 +4607,7 @@ psPt	src/Dodge/LevelGen/PlacementHelper.hs	24;"	f
 psPtCont	src/Dodge/LevelGen/PlacementHelper.hs	18;"	f
 psPtJpl	src/Dodge/LevelGen/PlacementHelper.hs	12;"	f
 psPtPl	src/Dodge/LevelGen/PlacementHelper.hs	9;"	f
-psRandRanges	src/Dodge/PlacementSpot.hs	263;"	f
+psRandRanges	src/Dodge/PlacementSpot.hs	267;"	f
 psj	src/Dodge/LevelGen/PlacementHelper.hs	70;"	f
 psposAddLabel	src/Dodge/PlacementSpot.hs	70;"	f
 pt0	src/Dodge/LevelGen/PlacementHelper.hs	54;"	f
@@ -4644,8 +4649,8 @@ qID	src/Quaternion.hs	62;"	f
 qToAng	src/Quaternion.hs	59;"	f
 qToV2	src/Quaternion.hs	56;"	f
 qToV3	src/Quaternion.hs	53;"	f
-quarterRoomSquare	src/Dodge/Room/Procedural.hs	212;"	f
-quarterRoomTri	src/Dodge/Room/Procedural.hs	176;"	f
+quarterRoomSquare	src/Dodge/Room/Procedural.hs	214;"	f
+quarterRoomTri	src/Dodge/Room/Procedural.hs	178;"	f
 quitCommand	src/Dodge/Terminal.hs	93;"	f
 qz	src/Quaternion.hs	71;"	f
 rLauncher	src/Dodge/Item/Held/Launcher.hs	14;"	f
@@ -4677,8 +4682,8 @@ randSparkExtraVel	src/Dodge/Spark.hs	92;"	f
 randWallReflect	src/Dodge/Update.hs	626;"	f
 randomChallenges	src/Dodge/Room/Start.hs	63;"	f
 randomCompass	src/Dodge/Layout.hs	57;"	f
-randomFourCornerRoom	src/Dodge/Room/Procedural.hs	265;"	f
-randomFourCornerRoomCrsIts	src/Dodge/Room/Procedural.hs	277;"	f
+randomFourCornerRoom	src/Dodge/Room/Procedural.hs	267;"	f
+randomFourCornerRoomCrsIts	src/Dodge/Room/Procedural.hs	279;"	f
 randomLightPositions	src/Dodge/Room/Modify/Girder.hs	152;"	f
 randomMediumRoom	src/Dodge/Room/Boss.hs	75;"	f
 randomPath	src/TreeHelp.hs	145;"	f
@@ -4781,12 +4786,12 @@ rmInvItem	src/Dodge/Inventory.hs	73;"	f
 rmLinksOfType	src/Dodge/RoomLink.hs	135;"	f
 rmOutLinks	src/Dodge/RoomLink.hs	138;"	f
 roomC	src/Dodge/Room/Room.hs	40;"	f
-roomCCrits	src/Dodge/Room/Room.hs	264;"	f
-roomCenterPillar	src/Dodge/Room/Room.hs	121;"	f
+roomCCrits	src/Dodge/Room/Room.hs	266;"	f
+roomCenterPillar	src/Dodge/Room/Room.hs	123;"	f
 roomCritLS	src/Dodge/Room/RunPast.hs	24;"	f
 roomCross	src/Dodge/Room/Boss.hs	84;"	f
 roomGlassOctogon	src/Dodge/Room/Boss.hs	21;"	f
-roomMiniIntro	src/Dodge/Room/Room.hs	116;"	f
+roomMiniIntro	src/Dodge/Room/Room.hs	118;"	f
 roomNgon	src/Dodge/Room/Ngon.hs	15;"	f
 roomPadCut	src/Dodge/Room/Room.hs	61;"	f
 roomPillars	src/Dodge/Room/Pillar.hs	106;"	f
@@ -4794,7 +4799,7 @@ roomPillarsContaining	src/Dodge/Room/Containing.hs	39;"	f
 roomPillarsPassage	src/Dodge/Room/Pillar.hs	93;"	f
 roomPillarsSquare	src/Dodge/Room/Pillar.hs	49;"	f
 roomRect	src/Dodge/Room/Procedural.hs	38;"	f
-roomRectAutoLinks	src/Dodge/Room/Procedural.hs	138;"	f
+roomRectAutoLinks	src/Dodge/Room/Procedural.hs	140;"	f
 roomShuriken	src/Dodge/Room/Boss.hs	122;"	f
 roomTwistCross	src/Dodge/Room/Boss.hs	153;"	f
 roomsContaining	src/Dodge/Room/Containing.hs	20;"	f
@@ -4985,10 +4990,10 @@ shellMag	src/Dodge/Item/Ammo.hs	49;"	f
 shellModule	src/Dodge/Item/Scope.hs	123;"	f
 shellShape	src/Dodge/Projectile/Draw.hs	35;"	f
 shieldWall	src/Dodge/Item/BackgroundEffect.hs	77;"	f
-shiftByV2	src/Dodge/PlacementSpot.hs	253;"	f
+shiftByV2	src/Dodge/PlacementSpot.hs	257;"	f
 shiftChildren	src/Dodge/Tree/Compose.hs	44;"	f
 shiftDraw	src/Dodge/Render/ShapePicture.hs	80;"	f
-shiftInBy	src/Dodge/PlacementSpot.hs	250;"	f
+shiftInBy	src/Dodge/PlacementSpot.hs	254;"	f
 shiftInvItems	src/Dodge/Update/Input/InGame.hs	305;"	f
 shiftInvItemsDown	src/Dodge/Update/Input/InGame.hs	350;"	f
 shiftInvItemsUp	src/Dodge/Update/Input/InGame.hs	344;"	f
@@ -5016,10 +5021,10 @@ shootShatter	src/Dodge/Item/Weapon/Shatter.hs	11;"	f
 shootTeslaArc	src/Dodge/HeldUse.hs	1211;"	f
 shootTillEmpty	src/Dodge/Creature/Volition.hs	19;"	f
 shootTractorBeam	src/Dodge/HeldUse.hs	794;"	f
-shootersRoom	src/Dodge/Room/Room.hs	317;"	f
-shootersRoom'	src/Dodge/Room/Room.hs	284;"	f
-shootersRoom1	src/Dodge/Room/Room.hs	307;"	f
-shootingRange	src/Dodge/Room/Room.hs	334;"	f
+shootersRoom	src/Dodge/Room/Room.hs	319;"	f
+shootersRoom'	src/Dodge/Room/Room.hs	286;"	f
+shootersRoom1	src/Dodge/Room/Room.hs	309;"	f
+shootingRange	src/Dodge/Room/Room.hs	336;"	f
 shortPoint2	src/Dodge/ShortShow.hs	4;"	f
 shortShow	src/ShortShow.hs	7;"	f
 shotgunS	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	708;"	f
@@ -5058,8 +5063,8 @@ slap1S	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	670;"	f
 slapS	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	604;"	f
 slideDoorS	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	688;"	f
 slideWindow	src/ListHelp.hs	80;"	f
-slowDoorRoom	src/Dodge/Room/LongDoor.hs	154;"	f
-slowDoorRoomRunPast	src/Dodge/Room/LongDoor.hs	171;"	f
+slowDoorRoom	src/Dodge/Room/LongDoor.hs	156;"	f
+slowDoorRoomRunPast	src/Dodge/Room/LongDoor.hs	173;"	f
 smallBattery	src/Dodge/Item/Ammo.hs	60;"	f
 smallBranch	src/Dodge/Tree/GenerateStructure.hs	32;"	f
 smallChaseCrit	src/Dodge/Creature/ChaseCrit.hs	14;"	f
@@ -5091,7 +5096,7 @@ soundToOnomato	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	150;"	f
 soundToVol	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	4;"	f
 soundWithStatus	src/Dodge/SoundLogic.hs	104;"	f
 soundWithStatusVolume	src/Dodge/SoundLogic.hs	54;"	f
-southPillarsRoom	src/Dodge/Room/LongDoor.hs	86;"	f
+southPillarsRoom	src/Dodge/Room/LongDoor.hs	87;"	f
 spaceAction	src/Dodge/Update/Input/InGame.hs	528;"	f
 spanColLightBlackI	src/Dodge/Placement/Instance/LightSource.hs	193;"	f
 spanColLightI	src/Dodge/Placement/Instance/LightSource.hs	186;"	f
@@ -5104,7 +5109,7 @@ sparkRandDir	src/Dodge/Spark.hs	116;"	f
 sparkToDamage	src/Dodge/Spark.hs	39;"	f
 spawnAt	src/Dodge/SpawnAt.hs	14;"	f
 spawnerCrit	src/Dodge/Creature.hs	56;"	f
-spawnerRoom	src/Dodge/Room/Room.hs	362;"	f
+spawnerRoom	src/Dodge/Room/Room.hs	364;"	f
 speedLegs	src/Dodge/Item/Equipment.hs	90;"	f
 splashMenu	src/Dodge/Menu.hs	30;"	f
 splashMenuOptions	src/Dodge/Menu.hs	35;"	f
@@ -5387,8 +5392,8 @@ tutRezBox	src/Dodge/Room/Tutorial.hs	210;"	f
 tutRoomTree	src/Dodge/Floor.hs	21;"	f
 tutorialMessage1	src/Dodge/Room/Tutorial.hs	232;"	f
 tweenAngles	src/Geometry/Vector.hs	195;"	f
-twinSlowDoorChasers	src/Dodge/Room/LongDoor.hs	80;"	f
-twinSlowDoorRoom	src/Dodge/Room/LongDoor.hs	28;"	f
+twinSlowDoorChasers	src/Dodge/Room/LongDoor.hs	81;"	f
+twinSlowDoorRoom	src/Dodge/Room/LongDoor.hs	29;"	f
 twists	src/Dodge/Creature/Test.hs	99;"	f
 twoFlat	src/Dodge/Creature/Test.hs	96;"	f
 twoFlatHRot	src/Dodge/Item/HeldOffset.hs	81;"	f
@@ -5415,7 +5420,7 @@ untilJustCount	src/MonadHelp.hs	14;"	f
 unusedOffPathAwayFromLink	src/Dodge/PlacementSpot.hs	138;"	f
 unusedSpotAwayFromInLink	src/Dodge/PlacementSpot.hs	144;"	f
 unusedSpotAwayFromLink	src/Dodge/PlacementSpot.hs	126;"	f
-unusedSpotNearInLink	src/Dodge/PlacementSpot.hs	200;"	f
+unusedSpotNearInLink	src/Dodge/PlacementSpot.hs	203;"	f
 updateAimPos	src/Dodge/Update.hs	302;"	f
 updateAllNodes	src/TreeHelp.hs	86;"	f
 updateArc	src/Dodge/Tesla.hs	44;"	f
@@ -5557,7 +5562,7 @@ useHotkey	src/Dodge/Creature/YourControl.hs	76;"	f
 useInventoryPath	src/Dodge/HeldUse.hs	1427;"	f
 useItem	src/Dodge/Creature/Impulse/UseItem.hs	19;"	f
 useItemLoc	src/Dodge/Creature/Impulse/UseItem.hs	26;"	f
-useLnkRoomPos	src/Dodge/PlacementSpot.hs	258;"	f
+useLnkRoomPos	src/Dodge/PlacementSpot.hs	262;"	f
 useLoadedAmmo	src/Dodge/HeldUse.hs	716;"	f
 useMagShield	src/Dodge/Euse.hs	27;"	f
 useNormalCamera	src/Dodge/Camera.hs	6;"	f
@@ -5568,8 +5573,8 @@ useRoomPosRoomCond	src/Dodge/PlacementSpot.hs	190;"	f
 useStopWatch	src/Dodge/HeldUse.hs	1368;"	f
 useTimeScrollGun	src/Dodge/HeldUse.hs	1376;"	f
 useUnusedLnk	src/Dodge/PlacementSpot.hs	178;"	f
-usedRoomInLinkPoss	src/Dodge/PlacementSpot.hs	206;"	f
-usedRoomLinkPoss	src/Dodge/PlacementSpot.hs	213;"	f
+usedRoomInLinkPoss	src/Dodge/PlacementSpot.hs	209;"	f
+usedRoomLinkPoss	src/Dodge/PlacementSpot.hs	216;"	f
 v2z	src/Geometry/Vector3D.hs	93;"	f
 vCen3	src/Geometry/Vector3D.hs	115;"	f
 vInverse	src/Geometry/Vector.hs	153;"	f
@@ -5610,7 +5615,7 @@ wallToSurface	src/Dodge/Base/Collide.hs	172;"	f
 wallsFromRooms	src/Dodge/Layout.hs	131;"	f
 wallsToDraw	src/Dodge/Render/Walls.hs	17;"	f
 warmupSound	src/Dodge/HeldUse.hs	1421;"	f
-warningRooms	src/Dodge/Room/Warning.hs	26;"	f
+warningRooms	src/Dodge/Room/Warning.hs	30;"	f
 wasdAim	src/Dodge/Creature/YourControl.hs	132;"	f
 wasdDir	src/Dodge/WASD.hs	17;"	f
 wasdM	src/Dodge/WASD.hs	9;"	f
@@ -5619,12 +5624,12 @@ wasdWithAiming	src/Dodge/Creature/YourControl.hs	125;"	f
 watchCombinations	src/Dodge/Combine/Combinations.hs	16;"	f
 watchUpdateStrat	src/Dodge/Creature/ReaderUpdate.hs	179;"	f
 weakenMatS	src/Dodge/Material/Sound.hs	18;"	f
-weaponBehindPillar	src/Dodge/Room/Room.hs	179;"	f
-weaponBetweenPillars	src/Dodge/Room/Room.hs	195;"	f
-weaponEmptyRoom	src/Dodge/Room/Room.hs	140;"	f
-weaponLongCorridor	src/Dodge/Room/Room.hs	220;"	f
-weaponRoom	src/Dodge/Room/Room.hs	253;"	f
-weaponUnderCrits	src/Dodge/Room/Room.hs	158;"	f
+weaponBehindPillar	src/Dodge/Room/Room.hs	181;"	f
+weaponBetweenPillars	src/Dodge/Room/Room.hs	197;"	f
+weaponEmptyRoom	src/Dodge/Room/Room.hs	142;"	f
+weaponLongCorridor	src/Dodge/Room/Room.hs	222;"	f
+weaponRoom	src/Dodge/Room/Room.hs	255;"	f
+weaponUnderCrits	src/Dodge/Room/Room.hs	160;"	f
 wedgeGeom	src/Dodge/Base.hs	42;"	f
 wedgeOfThickness	src/Dodge/Picture.hs	9;"	f
 whirS	src/Dodge/SoundLogic/ExternallyGeneratedSounds.hs	712;"	f
@@ -5702,7 +5707,7 @@ zConnectColMidX	src/Dodge/Render/Connectors.hs	31;"	f
 zeroZ	src/Geometry/Vector.hs	8;"	f
 zipArcs	src/Dodge/Tesla.hs	52;"	f
 zipCount	src/Dodge/Tree/Shift.hs	129;"	f
-zipCountDown	src/Dodge/Room/Procedural.hs	118;"	f
+zipCountDown	src/Dodge/Room/Procedural.hs	120;"	f
 zoneCloud	src/Dodge/Zoning/Cloud.hs	27;"	f
 zoneClouds	src/Dodge/Update.hs	460;"	f
 zoneCreature	src/Dodge/Zoning/Creature.hs	54;"	f