Leveler

Tap a tile. It goes up one level, and so do the tiles touching it: the ones above, below, left and right. A tile that is already at the top drops back to the floor.

There are three levels: floor, mid and top. The goal is to get every tile to the top. The small bars on each tile show its level: one bar for floor, two for mid, three for top.

There is no timer and nothing to lose. Undo as many times as you like. Hint shows the next tile to tap. Every puzzle can be solved, and you can always finish from wherever you are.