diff --git a/src/mightypork/rogue/world/Sides.java b/src/mightypork/rogue/world/Sides.java
index 78e018a..0441378 100644
--- a/src/mightypork/rogue/world/Sides.java
+++ b/src/mightypork/rogue/world/Sides.java
@@ -2,26 +2,26 @@ package mightypork.rogue.world;
 
 
 public class Sides {
-
-	//@formatter:off
+	
 	public static final byte NW = (byte) 0b10000000;
-	public static final byte N  = 0b01000000;
+	public static final byte N = 0b01000000;
 	public static final byte NE = 0b00100000;
-	public static final byte E  = 0b00010000;
+	public static final byte E = 0b00010000;
 	public static final byte SE = 0b00001000;
-	public static final byte S  = 0b00000100;
+	public static final byte S = 0b00000100;
 	public static final byte SW = 0b00000010;
-	public static final byte W  = 0b00000001;
+	public static final byte W = 0b00000001;
 	
-	public static final byte CARDINAL = N|S|E|W;
-	public static final byte DIAGONAL = NE|NW|SE|SW;
+	public static final byte CARDINAL = N | S | E | W;
+	public static final byte DIAGONAL = NE | NW | SE | SW;
 	
-	public static final byte NW_CORNER = W|NW|N;
-	public static final byte NE_CORNER = E|NE|N;
-	public static final byte SW_CORNER = W|SW|S;
-	public static final byte SE_CORNER = E|SE|S;
+	public static final byte NW_CORNER = W | NW | N;
+	public static final byte NE_CORNER = E | NE | N;
+	public static final byte SW_CORNER = W | SW | S;
+	public static final byte SE_CORNER = E | SE | S;
 	
-	private final static Coord[] side = {
+	//@formatter:off	
+	public final static Coord[] allSides = {
 			Coord.make(-1, -1),
 			Coord.make(0, -1),
 			Coord.make(1, -1),
@@ -31,13 +31,28 @@ public class Sides {
 			Coord.make(-1, 1),
 			Coord.make(-1, 0)
 	};
+	
+	public final static Coord[] cardinalSides = {
+		Coord.make(0, -1),
+		Coord.make(1, 0),
+		Coord.make(0, 1),
+		Coord.make(-1, 0)
+	};
+	
 	//@formatter:on
-
+	
+	/**
+	 * Get element from all sides
+	 * 
+	 * @param i side index
+	 * @return the side coord
+	 */
 	public static Coord get(int i)
 	{
-		return side[i]; // FIXME Coord is mutable
+		return allSides[i]; // FIXME Coord is mutable
 	}
-
+	
+	
 	public static byte bit(int i)
 	{
 		return (byte) (1 << (7 - i));
diff --git a/src/mightypork/rogue/world/entity/Entity.java b/src/mightypork/rogue/world/entity/Entity.java
index 5e8f676..fa31ab8 100644
--- a/src/mightypork/rogue/world/entity/Entity.java
+++ b/src/mightypork/rogue/world/entity/Entity.java
@@ -6,6 +6,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 import mightypork.rogue.world.Coord;
+import mightypork.rogue.world.Sides;
 import mightypork.rogue.world.World;
 import mightypork.rogue.world.entity.models.EntityModel;
 import mightypork.rogue.world.entity.models.EntityMoveListener;
@@ -78,6 +79,12 @@ public final class Entity implements IonBinary {
 		{
 			return model.getPathCost(Entity.this, from, to);
 		}
+
+		
+		@Override
+		public Coord[] getWalkSides() {
+			return Sides.cardinalSides;
+		}
 	};
 	
 	
diff --git a/src/mightypork/rogue/world/entity/models/PlayerModel.java b/src/mightypork/rogue/world/entity/models/PlayerModel.java
index 9c910ff..5f2b641 100644
--- a/src/mightypork/rogue/world/entity/models/PlayerModel.java
+++ b/src/mightypork/rogue/world/entity/models/PlayerModel.java
@@ -46,7 +46,7 @@ public class PlayerModel extends EntityModel {
 	
 	private void exploreSurroundings(Entity entity)
 	{
-		entity.getLevel().markExplored(entity.getCoord(), 4.5);
+		entity.getLevel().explore(entity.getCoord());
 	}
 	
 	
diff --git a/src/mightypork/rogue/world/gen/ScratchMap.java b/src/mightypork/rogue/world/gen/ScratchMap.java
index bc3803f..544b42f 100644
--- a/src/mightypork/rogue/world/gen/ScratchMap.java
+++ b/src/mightypork/rogue/world/gen/ScratchMap.java
@@ -15,7 +15,6 @@ import mightypork.rogue.world.pathfinding.PathFinder;
 import mightypork.rogue.world.pathfinding.PathFindingContext;
 import mightypork.rogue.world.tile.Tile;
 import mightypork.rogue.world.tile.TileModel;
-import mightypork.rogue.world.tile.TileType;
 import mightypork.rogue.world.tile.Tiles;
 import mightypork.util.logging.Log;
 import mightypork.util.math.Calc;
@@ -78,6 +77,11 @@ public class ScratchMap {
 			return PathFinder.CORNER_HEURISTIC;
 		}
 		
+		@Override
+		public Coord[] getWalkSides() {
+			return Sides.cardinalSides;
+		}
+		
 	};
 	
 	Coord genMin;
diff --git a/src/mightypork/rogue/world/level/Level.java b/src/mightypork/rogue/world/level/Level.java
index 671ad8c..8697ff4 100644
--- a/src/mightypork/rogue/world/level/Level.java
+++ b/src/mightypork/rogue/world/level/Level.java
@@ -9,17 +9,20 @@ import java.util.Map;
 import java.util.Set;
 
 import mightypork.rogue.world.Coord;
+import mightypork.rogue.world.Sides;
 import mightypork.rogue.world.World;
 import mightypork.rogue.world.entity.Entity;
+import mightypork.rogue.world.pathfinding.FillContext;
+import mightypork.rogue.world.pathfinding.FloodFill;
 import mightypork.rogue.world.tile.Tile;
 import mightypork.rogue.world.tile.TileModel;
+import mightypork.rogue.world.tile.TileType;
 import mightypork.rogue.world.tile.Tiles;
 import mightypork.util.files.ion.IonBinary;
 import mightypork.util.files.ion.IonBundle;
 import mightypork.util.files.ion.IonInput;
 import mightypork.util.files.ion.IonOutput;
 import mightypork.util.logging.Log;
-import mightypork.util.math.Calc;
 import mightypork.util.math.noise.NoiseGen;
 
 
@@ -319,20 +322,40 @@ public class Level implements MapAccess, IonBinary {
 	}
 	
 	
-	public void markExplored(Coord coord, double radius)
+	public void explore(Coord center)
 	{
-		final int cr = (int) Math.ceil(radius);
+		Collection<Coord> filled = FloodFill.fill(center, exploreFc);
+		for(Coord c : filled) getTile(c).setExplored();
+	}
+	
+	private FillContext exploreFc = new FillContext() {
 		
-		final Coord c = Coord.zero();
-		for (c.y = coord.y - cr; c.y <= coord.y + cr; c.y++) {
-			for (c.x = coord.x - cr; c.x <= coord.x + cr; c.x++) {
-				if (Calc.dist(coord.x, coord.y, c.x, c.y) > radius) continue;
-				final Tile t = getTile(c);
-				if (!t.isNull()) {
-					t.setExplored();
-				}
-			}
+		@Override
+		public Coord[] getSpreadSides()
+		{
+			return Sides.allSides;
 		}
 		
-	}
+		
+		@Override
+		public double getMaxDistance()
+		{
+			return 6;
+		}
+		
+		
+		@Override
+		public boolean canSpreadFrom(Coord pos)
+		{
+			Tile t = getTile(pos);
+			return t.isWalkable() && t.getType() != TileType.DOOR;
+		}
+		
+		
+		@Override
+		public boolean canEnter(Coord pos)
+		{
+			return !getTile(pos).isNull();
+		}
+	};
 }
diff --git a/src/mightypork/rogue/world/pathfinding/FillContext.java b/src/mightypork/rogue/world/pathfinding/FillContext.java
index 10c3cb8..1f6c1d8 100644
--- a/src/mightypork/rogue/world/pathfinding/FillContext.java
+++ b/src/mightypork/rogue/world/pathfinding/FillContext.java
@@ -9,13 +9,14 @@ public interface FillContext {
 	boolean canEnter(Coord pos);
 	
 	
-	boolean canSpread(Coord pos);
+	boolean canSpreadFrom(Coord pos);
 	
+	Coord[] getSpreadSides();	
 	
 	/**
 	 * Get the max distance filled form start point. Use -1 for unlimited range.
 	 * 
 	 * @return max distance
 	 */
-	int getMaxDistance();
+	double getMaxDistance();
 }
diff --git a/src/mightypork/rogue/world/pathfinding/FloodFill.java b/src/mightypork/rogue/world/pathfinding/FloodFill.java
index 6decd8d..0c2dc88 100644
--- a/src/mightypork/rogue/world/pathfinding/FloodFill.java
+++ b/src/mightypork/rogue/world/pathfinding/FloodFill.java
@@ -1,37 +1,47 @@
 package mightypork.rogue.world.pathfinding;
 
 
-import java.util.*;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.Stack;
 
 import mightypork.rogue.world.Coord;
 
 
-public class FloodFill {
-	
-	private static final Coord[] spread = { Coord.make(0, -1), Coord.make(0, 1), Coord.make(1, 0), Coord.make(-1, 0) };
-	
+public class FloodFill {	
 	
 	public static final Collection<Coord> fill(Coord start, FillContext context)
 	{
 		Set<Coord> filled = new HashSet<>();
 		Stack<Coord> active = new Stack<>();
 		
-		int maxDist = context.getMaxDistance();
+		double maxDist = context.getMaxDistance();
 		
 		active.push(start);
 		
-		while (!active.isEmpty()) {
+		Coord[] sides = context.getSpreadSides();
+		boolean first = true;
+		
+		while (!active.isEmpty()) {			
 			Coord current = active.pop();
-			
 			filled.add(current);
 			
-			for (Coord spr : spread) {
+			if(!context.canSpreadFrom(current) && !first) continue;
+			
+			first = false;
+			
+			
+			for (Coord spr : sides) {
 				Coord next = current.add(spr);
+				if(active.contains(next) || filled.contains(next)) continue;
 				
 				if (next.dist(start) > maxDist) continue;
 				
-				if (context.canSpread(next)) {
+				if (context.canEnter(next)) {
 					active.push(next);
+				} else {
+					filled.add(next);
 				}
 			}
 		}
diff --git a/src/mightypork/rogue/world/pathfinding/PathFinder.java b/src/mightypork/rogue/world/pathfinding/PathFinder.java
index 755be29..b104bc8 100644
--- a/src/mightypork/rogue/world/pathfinding/PathFinder.java
+++ b/src/mightypork/rogue/world/pathfinding/PathFinder.java
@@ -58,14 +58,7 @@ public class PathFinder {
 			open.add(n);
 		}
 		
-		//@formatter:off
-		final Coord[] walkDirs = {
-				Coord.make(0, -1),
-				Coord.make(0, 1),
-				Coord.make(-1, 0),
-				Coord.make(1, 0)
-		};
-		//@formatter:on
+		final Coord[] walkDirs = context.getWalkSides();
 		
 		Node current = null;
 		
diff --git a/src/mightypork/rogue/world/pathfinding/PathFindingContext.java b/src/mightypork/rogue/world/pathfinding/PathFindingContext.java
index 9bfca49..8745e5c 100644
--- a/src/mightypork/rogue/world/pathfinding/PathFindingContext.java
+++ b/src/mightypork/rogue/world/pathfinding/PathFindingContext.java
@@ -33,4 +33,7 @@ public interface PathFindingContext {
 	 * @return used heuristic
 	 */
 	Heuristic getHeuristic();
+
+
+	Coord[] getWalkSides();
 }
diff --git a/src/mightypork/rogue/world/tile/TileModel.java b/src/mightypork/rogue/world/tile/TileModel.java
index 04cc856..f87543f 100644
--- a/src/mightypork/rogue/world/tile/TileModel.java
+++ b/src/mightypork/rogue/world/tile/TileModel.java
@@ -2,6 +2,7 @@ package mightypork.rogue.world.tile;
 
 
 import java.io.IOException;
+
 import mightypork.util.files.ion.IonInput;
 import mightypork.util.files.ion.IonOutput;
 
diff --git a/src/mightypork/util/files/ion/IonBinary.java b/src/mightypork/util/files/ion/IonBinary.java
index 455918b..0696db1 100644
--- a/src/mightypork/util/files/ion/IonBinary.java
+++ b/src/mightypork/util/files/ion/IonBinary.java
@@ -1,7 +1,6 @@
 package mightypork.util.files.ion;
 
 
-import java.io.IOException;
 
 
 /**