Setris

Setris is a puzzle game inspired by Tetris mechanics, where the player must place falling blocks into lines. The twist here is that when the blocks hit the bottom of the screen, they dissolve into piles of sand. The player must place the blocks in such a way that they'll form lines across even after the blocks collapse. The game went mildly viral after release, prompting a name change to Sandtrix because of possible legal action from The Tetris Company or the similarly-named puzzle title Sentris.