So this game doesn't really exist anymore, but here goes: There was this game on the Xbox LIVE Indie Games Marketplace called "Block Fight!".
It had a cover drawn in MS Paint with the curve tool, and the game itself wasn't really even...a game.
The games starts up to a white screen with two blocks on it, and a health and score value.
You control both blocks with the left stick, up and down on it moving one block, left and right moving the other.
When the blocks touched, the Health value went down and the score value go up, and the blocks reset to their initial positions. When the health gets lower than zero, it just starts going into the negatives. An odd thing is pressing any of the other buttons made the values change in reasonless ways, for example RT makes the health value go up, and clicking RS makes the score go down.
This game was removed from the marketplace some time ago.