Simple puzzle game. But it is getting really hard at the end. It is just a game you see on trailers, but done well.

Over 360 levels, that scale with difficulty over time. Puzzles are challenging, like those in the best logic games. To get achievement you often need to complete a level in different way than most obvious. There is no tutorial, so you need to figure out how each mechanic work, but learning that is mega satisfying.

Very absorbing game. It has simple premise, but takes it in various interesting directions. There's the "just one more puzzle" syndrome with progressivly harder riddles as you go on.