diff --git a/Shared/World.cs b/Shared/World.cs
index b904a70..c840efd 100644
--- a/Shared/World.cs
+++ b/Shared/World.cs
@@ -8,6 +8,10 @@ using System.Linq;
 namespace SemiColinGames {
 
   public class Tile {
+    public static int CompareByX(Tile t1, Tile t2) {
+      return t1.Position.X.CompareTo(t2.Position.X);
+    }
+
     private TextureRef texture;
     private Rectangle textureSource;
 
@@ -29,19 +33,19 @@ namespace SemiColinGames {
 
   public class World {
 
+    public const int TileSize = 16;
+
     // Size of World in terms of tile grid.
     private int gridWidth;
     private int gridHeight;
-
-    // TODO: remove this.
-    public const int TileSize = 16;
-    readonly Tile[] obstacles;
-    readonly Tile[] decorations;
+    private readonly Tile[] obstacles;
+    private readonly Tile[] decorations;
     // Kept around for resetting the world's entities after player death or level restart.
-    readonly JToken entitiesLayer;
+    private readonly JToken entitiesLayer;
+    private NPC[] npcs;
 
-    NPC[] npcs;
     public Player Player { get; private set; }
+    public AABB[] CollisionTargets { get; }
 
     // Size of World in pixels.
     public int Width {
@@ -52,61 +56,6 @@ namespace SemiColinGames {
       get { return gridHeight * TileSize; }
     }
 
-    private List<Tile> ParseLayer(JToken layer) {
-      string layerName = layer.SelectToken("name").Value<string>();
-
-      var tileList = new List<Tile>();
-
-      int layerWidth = layer.SelectToken("gridCellsX").Value<int>();
-      int layerHeight = layer.SelectToken("gridCellsY").Value<int>();
-      gridWidth = Math.Max(gridWidth, layerWidth);
-      gridHeight = Math.Max(gridHeight, layerHeight);
-
-      int dataIndex = -1;
-      int tileWidth = layer.SelectToken("gridCellWidth").Value<int>();
-      int tileHeight = layer.SelectToken("gridCellHeight").Value<int>();
-      int textureWidth = Textures.Grassland.Get.Width / tileWidth;
-      foreach (int textureIndex in layer.SelectToken("data").Values<int>()) {
-        dataIndex++;
-        if (textureIndex == -1) {
-          continue;
-        }
-        int i = dataIndex % layerWidth;
-        int j = dataIndex / layerWidth;
-        Rectangle position = new Rectangle(
-            i * tileWidth, j * tileHeight, tileWidth, tileHeight);
-        int x = textureIndex % textureWidth;
-        int y = textureIndex / textureWidth;
-        Rectangle textureSource = new Rectangle(
-            x * tileWidth, y * tileHeight, tileWidth, tileHeight);
-        bool isHazard = layerName == "hazards";
-        tileList.Add(new Tile(Textures.Grassland, textureSource, position, isHazard));
-      }
-
-      return tileList;
-    }
-
-    private (Player, NPC[]) ParseEntities(JToken layer) {
-      Player player = null;
-      List<NPC> npcs = new List<NPC>();
-      foreach (JToken entity in layer.SelectToken("entities").Children()) {
-        string name = entity.SelectToken("name").Value<string>();
-        int x = entity.SelectToken("x").Value<int>();
-        int y = entity.SelectToken("y").Value<int>();
-        int facing = entity.SelectToken("flippedX").Value<bool>() ? -1 : 1;
-        if (name == "player") {
-          player = new Player(new Point(x, y), facing);
-        } else if (name == "executioner") {
-          npcs.Add(new NPC(new Point(x, y), facing));
-        }
-      }
-      return (player, npcs.ToArray());
-    }
-
-    static int CompareByX(Tile t1, Tile t2) {
-      return t1.Position.X.CompareTo(t2.Position.X);
-    }
-
     public World(string json) {
       JObject root = JObject.Parse(json);
 
@@ -135,7 +84,7 @@ namespace SemiColinGames {
       // Get all the obstacles into a single array, sorted by X.
       obstacleTiles.AddRange(hazardTiles);
       obstacles = obstacleTiles.ToArray();
-      Array.Sort(obstacles, CompareByX);
+      Array.Sort(obstacles, Tile.CompareByX);
       // The background tiles are added before the rest of the decorations, so that they're drawn
       // in the back.
       backgroundTiles.AddRange(decorationTiles);
@@ -162,6 +111,61 @@ namespace SemiColinGames {
           new Vector2(Width + 1, 0), new Vector2(1, float.MaxValue));
     }
 
+    private List<Tile> ParseLayer(JToken layer) {
+      string layerName = layer.SelectToken("name").Value<string>();
+
+      var tileList = new List<Tile>();
+
+      int layerWidth = layer.SelectToken("gridCellsX").Value<int>();
+      int layerHeight = layer.SelectToken("gridCellsY").Value<int>();
+      gridWidth = Math.Max(gridWidth, layerWidth);
+      gridHeight = Math.Max(gridHeight, layerHeight);
+
+      int dataIndex = -1;
+      int tileWidth = layer.SelectToken("gridCellWidth").Value<int>();
+      int tileHeight = layer.SelectToken("gridCellHeight").Value<int>();
+      int textureWidth = Textures.Grassland.Get.Width / tileWidth;
+      foreach (int textureIndex in layer.SelectToken("data").Values<int>()) {
+        dataIndex++;
+        if (textureIndex == -1) {
+          continue;
+        }
+        int i = dataIndex % layerWidth;
+        int j = dataIndex / layerWidth;
+        Rectangle position = new Rectangle(
+            i * tileWidth, j * tileHeight, tileWidth, tileHeight);
+        int x = textureIndex % textureWidth;
+        int y = textureIndex / textureWidth;
+        Rectangle textureSource = new Rectangle(
+            x * tileWidth, y * tileHeight, tileWidth, tileHeight);
+        bool isHazard = layerName == "hazards";
+        tileList.Add(new Tile(Textures.Grassland, textureSource, position, isHazard));
+      }
+
+      return tileList;
+    }
+
+    private (Player, NPC[]) ParseEntities(JToken layer) {
+      Player player = null;
+      List<NPC> npcs = new List<NPC>();
+      foreach (JToken entity in layer.SelectToken("entities").Children()) {
+        string name = entity.SelectToken("name").Value<string>();
+        int x = entity.SelectToken("x").Value<int>();
+        int y = entity.SelectToken("y").Value<int>();
+        int facing = entity.SelectToken("flippedX").Value<bool>() ? -1 : 1;
+        if (name == "player") {
+          player = new Player(new Point(x, y), facing);
+        } else if (name == "executioner") {
+          npcs.Add(new NPC(new Point(x, y), facing));
+        }
+      }
+      return (player, npcs.ToArray());
+    }
+
+    private void Reset() {
+      (Player, npcs) = ParseEntities(entitiesLayer);
+    }
+
     public void Update(float modelTime, History<Input> input) {
       Player.Update(modelTime, this, input);
       foreach (NPC npc in npcs) {
@@ -172,10 +176,6 @@ namespace SemiColinGames {
       }
     }
 
-    void Reset() {
-      (Player, npcs) = ParseEntities(entitiesLayer);
-    }
-
     // Draws everything that's behind the player, from back to front.
     public void DrawBackground(SpriteBatch spriteBatch) {
       foreach (Tile t in decorations) {
@@ -192,7 +192,5 @@ namespace SemiColinGames {
         t.Draw(spriteBatch);
       }
     }
-
-    public AABB[] CollisionTargets { get; }
   }
 }