diff --git a/Shared/World.cs b/Shared/World.cs
index b305f43..df14a22 100644
--- a/Shared/World.cs
+++ b/Shared/World.cs
@@ -18,46 +18,75 @@ namespace SemiColinGames {
 
     private readonly static Dictionary<char, Terrain> mapping = new Dictionary<char, Terrain>();
 
-    public static Terrain Empty = new Terrain('\0', false, Textures.Grassland, 0, 0);
-    public static Terrain Grass = new Terrain('=', true, Textures.Grassland, 3, 0);
-    public static Terrain GrassL = new Terrain('<', true, Textures.Grassland, 2, 0);
-    public static Terrain GrassR = new Terrain('>', true, Textures.Grassland, 4, 0);
-    public static Terrain Rock = new Terrain('.', true, Textures.Grassland, 3, 1);
-    public static Terrain RockL = new Terrain('[', true, Textures.Grassland, 1, 2);
-    public static Terrain RockR = new Terrain(']', true, Textures.Grassland, 5, 2);
-    public static Terrain WaterL = new Terrain('~', false, Textures.Grassland, 9, 2);
-    public static Terrain WaterR = new Terrain('`', false, Textures.Grassland, 10, 2);
-    public static Terrain Block = new Terrain('X', true, Textures.Ruins, 2, 0);
-    public static Terrain Spike = new Terrain('^', true, Textures.Grassland, 11, 8, true);
-    public static Terrain Wood = new Terrain('_', true, Textures.Grassland, 10, 3);
-    public static Terrain WoodL = new Terrain('(', true, Textures.Grassland, 9, 3);
-    public static Terrain WoodR = new Terrain(')', true, Textures.Grassland, 12, 3);
-    public static Terrain WoodVert = new Terrain('|', false, Textures.Grassland, 9, 5);
-    public static Terrain WoodVertL = new Terrain('/', false, Textures.Grassland, 9, 4);
-    public static Terrain WoodVertR = new Terrain('\\', false, Textures.Grassland, 12, 4);
-    public static Terrain WoodBottom = new Terrain('v', false, Textures.Grassland, 10, 5);
-    public static Terrain FenceL = new Terrain('d', false, Textures.Grassland, 5, 4);
-    public static Terrain Fence = new Terrain('f', false, Textures.Grassland, 6, 4);
-    public static Terrain FencePost = new Terrain('x', false, Textures.Grassland, 7, 4);
-    public static Terrain FenceR = new Terrain('b', false, Textures.Grassland, 8, 4);
-    public static Terrain VineTop = new Terrain('{', false, Textures.Ruins, 12, 5);
-    public static Terrain VineMid = new Terrain(';', false, Textures.Ruins, 12, 6);
-    public static Terrain VineBottom = new Terrain('}', false, Textures.Ruins, 12, 7);
-    public static Terrain GrassTall = new Terrain('q', false, Textures.Grassland, 13, 0);
-    public static Terrain GrassShort = new Terrain('w', false, Textures.Grassland, 14, 0);
-    public static Terrain Shoots = new Terrain('e', false, Textures.Grassland, 15, 0);
-    public static Terrain Bush = new Terrain('r', false, Textures.Grassland, 13, 2);
-    public static Terrain Mushroom = new Terrain('t', false, Textures.Grassland, 17, 2);
+    public static Terrain Empty =
+        new Terrain('\0', Textures.Grassland, 0, 0);
+    public static Terrain Spike =
+        new Terrain('^', Textures.Grassland, 11, 8, isObstacle: true, isHarmful: true);
+    public static Terrain Grass =
+        new Terrain('=', Textures.Grassland, 3, 0, isObstacle: true);
+    public static Terrain GrassL =
+        new Terrain('<', Textures.Grassland, 2, 0, isObstacle: true);
+    public static Terrain GrassR =
+        new Terrain('>', Textures.Grassland, 4, 0, isObstacle: true);
+    public static Terrain Rock =
+        new Terrain('.', Textures.Grassland, 3, 1, isObstacle: true);
+    public static Terrain RockL =
+        new Terrain('[', Textures.Grassland, 1, 2, isObstacle: true);
+    public static Terrain RockR =
+        new Terrain(']', Textures.Grassland, 5, 2, isObstacle: true);
+    public static Terrain Block =
+        new Terrain('X', Textures.Ruins, 2, 0, isObstacle: true);
+    public static Terrain Wood =
+        new Terrain('_', Textures.Grassland, 10, 3, isObstacle: true);
+    public static Terrain WoodL =
+        new Terrain('(', Textures.Grassland, 9, 3, isObstacle: true);
+    public static Terrain WoodR =
+        new Terrain(')', Textures.Grassland, 12, 3, isObstacle: true);
+    public static Terrain WoodVert =
+        new Terrain('|', Textures.Grassland, 9, 5);
+    public static Terrain WoodVertL =
+        new Terrain('/', Textures.Grassland, 9, 4);
+    public static Terrain WoodVertR =
+        new Terrain('\\', Textures.Grassland, 12, 4);
+    public static Terrain WoodBottom =
+        new Terrain('v', Textures.Grassland, 10, 5);
+    public static Terrain WaterL =
+        new Terrain('~', Textures.Grassland, 9, 2);
+    public static Terrain WaterR =
+        new Terrain('`', Textures.Grassland, 10, 2);
+    public static Terrain FenceL =
+        new Terrain('d', Textures.Grassland, 5, 4);
+    public static Terrain Fence =
+        new Terrain('f', Textures.Grassland, 6, 4);
+    public static Terrain FencePost =
+        new Terrain('x', Textures.Grassland, 7, 4);
+    public static Terrain FenceR =
+        new Terrain('b', Textures.Grassland, 8, 4);
+    public static Terrain VineTop =
+        new Terrain('{', Textures.Ruins, 12, 5);
+    public static Terrain VineMid =
+        new Terrain(';', Textures.Ruins, 12, 6);
+    public static Terrain VineBottom =
+        new Terrain('}', Textures.Ruins, 12, 7);
+    public static Terrain GrassTall =
+        new Terrain('q', Textures.Grassland, 13, 0);
+    public static Terrain GrassShort =
+        new Terrain('w', Textures.Grassland, 14, 0);
+    public static Terrain Shoots =
+        new Terrain('e', Textures.Grassland, 15, 0);
+    public static Terrain Bush =
+        new Terrain('r', Textures.Grassland, 13, 2);
+    public static Terrain Mushroom =
+        new Terrain('t', Textures.Grassland, 17, 2);
 
     public bool IsObstacle { get; private set; }
-    public bool IsHarmful { get; private set; } = false;
+    public bool IsHarmful { get; private set; }
     public TextureRef Texture { get; private set; }
     public Rectangle TextureSource { get; private set; }
 
-    private Terrain(char symbol, bool isObstacle, TextureRef texture, int x, int y) :
-        this(symbol, isObstacle, texture, x, y, false) {}
-
-    private Terrain(char symbol, bool isObstacle, TextureRef texture, int x, int y, bool isHarmful) {
+    private Terrain(
+        char symbol, TextureRef texture, int x, int y,
+        bool isObstacle = false, bool isHarmful = false) {
       if (mapping.ContainsKey(symbol)) {
         throw new ArgumentException("already have a terrain with symbol " + symbol);
       }