diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/blobs/Web.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/blobs/Web.java
index b53d37ff7..137df39cd 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/blobs/Web.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/blobs/Web.java
@@ -53,6 +53,7 @@ public class Web extends Blob {
 
 				l.solid[cell] = off[cell] > 0 || (Terrain.flags[l.map[cell]] & Terrain.SOLID) != 0;
 				l.flamable[cell] = off[cell] > 0 || (Terrain.flags[l.map[cell]] & Terrain.FLAMABLE) != 0;
+				l.updateOpenSpace(cell);
 			}
 		}
 	}
@@ -62,6 +63,7 @@ public class Web extends Blob {
 		super.seed(level, cell, amount);
 		level.solid[cell] = cur[cell] > 0 || (Terrain.flags[level.map[cell]] & Terrain.SOLID) != 0;
 		level.flamable[cell] = cur[cell] > 0 || (Terrain.flags[level.map[cell]] & Terrain.FLAMABLE) != 0;
+		level.updateOpenSpace(cell);
 	}
 
 	//affects characters as they step on it. See Level.OccupyCell and Level.PressCell
@@ -83,6 +85,7 @@ public class Web extends Blob {
 		Level l = Dungeon.level;
 		l.solid[cell] = cur[cell] > 0 || (Terrain.flags[l.map[cell]] & Terrain.SOLID) != 0;
 		l.flamable[cell] = cur[cell] > 0 || (Terrain.flags[l.map[cell]] & Terrain.FLAMABLE) != 0;
+		l.updateOpenSpace(cell);
 	}
 
 	@Override
@@ -97,6 +100,7 @@ public class Web extends Blob {
 			for (int i=0; i < l.length(); i++) {
 				l.solid[i] = l.solid[i] || cur[i] > 0;
 				l.flamable[i] = l.flamable[i] || cur[i] > 0;
+				//openSpace will be updated as part of building flap maps
 			}
 		}
 	}
diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/hero/spells/WallOfLight.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/hero/spells/WallOfLight.java
index 4bace8cda..210a25670 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/hero/spells/WallOfLight.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/hero/spells/WallOfLight.java
@@ -259,6 +259,7 @@ public class WallOfLight extends TargetedClericSpell {
 					l.solid[cell] = off[cell] > 0 || (Terrain.flags[l.map[cell]] & Terrain.SOLID) != 0;
 					l.passable[cell] = off[cell] == 0 && (Terrain.flags[l.map[cell]] & Terrain.PASSABLE) != 0;
 					l.avoid[cell] = off[cell] == 0 && (Terrain.flags[l.map[cell]] & Terrain.AVOID) != 0;
+					l.updateOpenSpace(cell);
 				}
 			}
 		}
@@ -269,6 +270,7 @@ public class WallOfLight extends TargetedClericSpell {
 			level.solid[cell] = cur[cell] > 0 || (Terrain.flags[level.map[cell]] & Terrain.SOLID) != 0;
 			level.passable[cell] = cur[cell] == 0 && (Terrain.flags[level.map[cell]] & Terrain.PASSABLE) != 0;
 			level.avoid[cell] = cur[cell] == 0 && (Terrain.flags[level.map[cell]] & Terrain.AVOID) != 0;
+			level.updateOpenSpace(cell);
 		}
 
 		@Override
@@ -279,6 +281,7 @@ public class WallOfLight extends TargetedClericSpell {
 			l.solid[cell] = cur[cell] > 0 || (Terrain.flags[l.map[cell]] & Terrain.SOLID) != 0;
 			l.passable[cell] = cur[cell] == 0 && (Terrain.flags[l.map[cell]] & Terrain.PASSABLE) != 0;
 			l.avoid[cell] = cur[cell] == 0 && (Terrain.flags[l.map[cell]] & Terrain.AVOID) != 0;
+			l.updateOpenSpace(cell);
 		}
 
 		@Override
@@ -294,6 +297,7 @@ public class WallOfLight extends TargetedClericSpell {
 					l.solid[i] = l.solid[i] || cur[i] > 0;
 					l.passable[i] = l.passable[i] && cur[i] == 0;
 					l.avoid[i] = l.avoid[i] && cur[i] == 0;
+					//openSpace will be updated as part of building flap maps
 				}
 			}
 		}
diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/artifacts/SkeletonKey.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/artifacts/SkeletonKey.java
index 9f95a86e0..8b786fd20 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/artifacts/SkeletonKey.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/artifacts/SkeletonKey.java
@@ -500,6 +500,7 @@ public class SkeletonKey extends Artifact {
 					l.solid[cell] = off[cell] > 0 || (Terrain.flags[l.map[cell]] & Terrain.SOLID) != 0;
 					l.passable[cell] = off[cell] == 0 && (Terrain.flags[l.map[cell]] & Terrain.PASSABLE) != 0;
 					l.avoid[cell] = off[cell] == 0 && (Terrain.flags[l.map[cell]] & Terrain.AVOID) != 0;
+					l.updateOpenSpace(cell);
 				}
 			}
 
@@ -515,6 +516,7 @@ public class SkeletonKey extends Artifact {
 			level.solid[cell] = cur[cell] > 0 || (Terrain.flags[level.map[cell]] & Terrain.SOLID) != 0;
 			level.passable[cell] = cur[cell] == 0 && (Terrain.flags[level.map[cell]] & Terrain.PASSABLE) != 0;
 			level.avoid[cell] = cur[cell] == 0 && (Terrain.flags[level.map[cell]] & Terrain.AVOID) != 0;
+			level.updateOpenSpace(cell);
 		}
 
 		@Override
@@ -526,6 +528,7 @@ public class SkeletonKey extends Artifact {
 			l.solid[cell] = cur[cell] > 0 || (Terrain.flags[l.map[cell]] & Terrain.SOLID) != 0;
 			l.passable[cell] = cur[cell] == 0 && (Terrain.flags[l.map[cell]] & Terrain.PASSABLE) != 0;
 			l.avoid[cell] = cur[cell] == 0 && (Terrain.flags[l.map[cell]] & Terrain.AVOID) != 0;
+			l.updateOpenSpace(cell);
 		}
 
 		@Override
@@ -542,6 +545,7 @@ public class SkeletonKey extends Artifact {
 					l.solid[i] = l.solid[i] || cur[i] > 0;
 					l.passable[i] = l.passable[i] && cur[i] == 0;
 					l.avoid[i] = l.avoid[i] && cur[i] == 0;
+					//openSpace will be updated as part of building flap maps
 				}
 			}
 		}
diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/Level.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/Level.java
index 34e0a8e9e..dee431226 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/Level.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/Level.java
@@ -878,6 +878,25 @@ public abstract class Level implements Bundlable {
 
 	}
 
+	//updates open space both on the cell itself and adjacent cells
+	public void updateOpenSpace(int cell){
+		for (int i : PathFinder.NEIGHBOURS9) {
+			if (solid[cell+i]){
+				openSpace[cell+i] = false;
+			} else {
+				for (int j = 1; j < PathFinder.CIRCLE8.length; j += 2){
+					if (solid[cell+i+PathFinder.CIRCLE8[j]]) {
+						openSpace[cell+i] = false;
+					} else if (!solid[cell+i+PathFinder.CIRCLE8[(j+1)%8]]
+							&& !solid[cell+i+PathFinder.CIRCLE8[(j+2)%8]]){
+						openSpace[cell+i] = true;
+						break;
+					}
+				}
+			}
+		}
+	}
+
 	public void destroy( int pos ) {
 		//if raw tile type is flammable or empty
 		int terr = map[pos];