Downloaded this onto my smartphone a while ago after watching a co-worker play it. Didn't play for very long, but it's a pretty creative puzzle game, and I can respect that.

The puzzles all feel the same after a while and the solutions aren't particularly difficult but it's made in such a way that finding solutions is still satisfying.

There's also a lot of variation in the game. There are lots of different modes that all put their own twist on the basic puzzle and there's even a timed mode which is pretty fun to try.