What?
=====
Tetris.
Very buggy Tetris, mainly due to its lack of wall kick.

Why?
====
One afternoon, I thought "Hey I'll write an AI to play Tetris!"

I assumed I could knock Tetris up in a few minutes, but it ended up taking
longer than I expected.
Rabbit holes and such.

So here's the Tetris (nearly), but I still haven't got around to the AI.