Pfactris

Full documentation: Download pfactrisX.Y.html

Tetris, but with arithmetic, each tile has an integer on it.
Drop a tile onto a tile below so that the numbers divide and cancel out.
Once a tile drops and cancels with the tile below,
it will attempt to cancel the next tile below that and so on.
If no more below-cancellations happen it will also try to cancel with the tile to the left and then the tile to the right of it.

For complete description go to Files tab and see readme.txt