Qualio! In this game, you play as a small box trying to get to the green checkpoint. Seems easy enough, right? But there's a catch - you must pass over and erase every tile on the board before you are allowed to enter the end point. Normal tiles are gray. You must pass over them once to destroy them Grate tiles must be passed over twice before they fall. Move with arrow keys or WASD - centered diagonally right. There are 25 levels - all are possible.
Full credit to KingOfAwesome58219