[Here is the spritesheet I'm using.](https://cloud.githubusercontent.com/assets/1808807/26451778/6e2d23f0-412b-11e7-8ecd-7cfc757293df.png) (3 pixel offset, 2 pixels between each tile, each tile is 21x21) [Here are the stack traces](https://gist.github.com/dyc3/6bf4f183b640a3160316643478c0698c.js)