diff --git a/Shared/Debug.cs b/Shared/Debug.cs
index bf8927c..22e3663 100644
--- a/Shared/Debug.cs
+++ b/Shared/Debug.cs
@@ -45,7 +45,6 @@ namespace SemiColinGames {
     }
 
     public static void DrawToast(SpriteBatch spriteBatch, SpriteFont font) {
-      // TODO: this use of toast isn't thread-safe.
       if (toast == null) {
         return;
       }
diff --git a/Shared/Player.cs b/Shared/Player.cs
index d88b245..22aab65 100644
--- a/Shared/Player.cs
+++ b/Shared/Player.cs
@@ -45,10 +45,7 @@ namespace SemiColinGames {
       Rectangle oldBbox = Bbox(oldPosition);
       Rectangle playerBbox = Bbox(position);
       bool standingOnGround = false;
-      // TODO: implement https://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm
-      // e.g. http://members.chello.at/~easyfilter/bresenham.html
-      // TODO: currently player doesn't fall through a gap one tile wide; presumably this will
-      // be fixed by switching to a line-rasterization approach.
+
       foreach (var rect in collisionTargets) {
         playerBbox = Bbox(position);
 
@@ -100,9 +97,6 @@ namespace SemiColinGames {
       }
     }
     
-    // TODO: refactor input to have a virtual "which directions & buttons were being pressed"
-    // instead of complicated if-statements in this function.
-    // TODO: refactor to use a state-machine.
     void UpdateFromInput(
       GameTime time, History<GamePadState> gamePad, History<KeyboardState> keyboard) {
       if ((gamePad[0].IsButtonDown(Buttons.A) && gamePad[1].IsButtonUp(Buttons.A) ||
@@ -124,8 +118,6 @@ namespace SemiColinGames {
       }
 
       Vector2 leftStick = gamePad[0].ThumbSticks.Left;
-      // TODO: have keyboard directions cancel each other out if mutually-incompatible keys are
-      // held down?
       if (gamePad[0].IsButtonDown(Buttons.DPadLeft) || leftStick.X < -0.5 ||
           keyboard[0].IsKeyDown(Keys.A)) {
         facing = Facing.Left;
@@ -162,7 +154,6 @@ namespace SemiColinGames {
         pose = Pose.Jumping;
       }
    
-      // TODO: also bound player position by the right edge of the World?
       position.X = Math.Max(position.X, 0 + spriteWidth);
     }
 
@@ -201,7 +192,6 @@ namespace SemiColinGames {
     }
 
     public void Draw(SpriteBatch spriteBatch, Camera camera, GameTime time) {
-      // TODO: don't create so many "new" things that could be cached / precomputed.
       int index = spritePosition(pose, time);
       Rectangle textureSource = new Rectangle(index * spriteSize, 0, spriteSize, spriteSize);
       Vector2 spriteCenter = new Vector2(spriteSize / 2, spriteSize / 2);
diff --git a/Shared/SneakGame.cs b/Shared/SneakGame.cs
index 828e3db..7f80cee 100644
--- a/Shared/SneakGame.cs
+++ b/Shared/SneakGame.cs
@@ -51,17 +51,15 @@ namespace SemiColinGames {
     protected override void LoadContent() {
       spriteBatch = new SpriteBatch(GraphicsDevice);
       font = Content.Load<SpriteFont>("font");
-      // TODO: decouple things like Player and World from their textures.
+
       player = new Player(Content.Load<Texture2D>("player_1x"));
       world = new World(Content.Load<Texture2D>("grassland"));
-      // TODO: move backgrounds into World.
       grasslandBg1 = Content.Load<Texture2D>("grassland_bg1");
       grasslandBg2 = Content.Load<Texture2D>("grassland_bg2");
     }
 
     // Called once per game. Unloads all game content.
     protected override void UnloadContent() {
-      // TODO: Unload any non ContentManager content here.
     }
 
     // Updates the game world.
diff --git a/Shared/World.cs b/Shared/World.cs
index 3f24cf6..6220462 100644
--- a/Shared/World.cs
+++ b/Shared/World.cs
@@ -35,7 +35,6 @@ namespace SemiColinGames {
       Vector2 drawPos = new Vector2(position.Left - camera.Left, position.Top);
       switch (terrain) {
         case Terrain.Grass: {
-          // TODO: hold these rectangles statically instead of making them anew constantly.
           Rectangle source = new Rectangle(3 * size, 0 * size, size, size);
           spriteBatch.Draw(texture, drawPos, source, Color.White);
           break;
@@ -112,7 +111,6 @@ namespace SemiColinGames {
 "...................................................................]  [.............]   [..............................................................]  [......................................................." };
 
     public World(Texture2D texture) {
-      // TODO: better error handling for if the string[] isn't rectangular.
       width = worldDesc[0].Length;
       height = worldDesc.Length;
       tiles = new Tile[width, height];