This game has debugging material.
Pyramid is a Tetris clone, but with wedged blocks instead of tetrominoes. It doesn't really work well, to say the least.
Picture Test (Hacker Version)
At the title screen, press Up, Down, Left, Right, Up, Down, Left, Right to access a picture test. Use the D-Pad to select a palette color, A or B to change its value, and Select to change the image.