Undotris

Tetris. But backwards.

Your goal is to clear the board, the catch?  Pieces float up from the bottom, and remove blocks from the top of the grid. Blocks only of the same colour can be removed, though you're assisted with a helpful preview of what will be removed (floating above the board means you won't be removing anything). For every tile of your piece you fail to map to a block, you lose a "save"; lose all of them, and a new line is added to the board. On the right is a preview of your next blocks—but you don't get to see what colour they will be. Plan ahead.

If you think about how the pieces are removed, you might think of them as the inverse operation of placing a piece in the first place; that is, each column needs to be able to see the top of the matrix.

Controls:

• Left, Right: Move/Select
• Up: Hard "Drop"
• Z: Rotate Contraclockwise/"A"-like button (accept, modify, etc.)
• X: Rotate Clockwise/"B"-like button (cancel, back, etc.)

Notes & Known Issues

There's a bug in the checking routine that means that the game is over once the matrix hits about 3rd or 4th to-the-top lines, so, uh, avoid that.

Also, there's also no victory or lose checking; empty the board? Congratulations, you win nothing. But the prize for filling the board's even more exciting: a crash!

(Apologies for those who want to play around with the options—they don't save between sessions—so you only get one game out of your options before having to reload.)

Originality

All works are original or just ripped from Tetris for the Nintendo Game Boy.