Symmetry Shuffle is a much harder game than it initially seems to be — but that’s not a negative for die-hard puzzle fans. The game’s premise — moving objects around on screen — is basic, but players quickly learn that there’s strategy involved. There are two modes: Timed and Solve. The former is a stress-filled affair, challenging you to solve puzzles and advance before time runs out. The other is more casual, letting players learn the game and begin to figure out their strategy. In either mode, though, hours can slip by as you try to figure out the best methods to win. It is a great app for challenging kids to use higher level thinking skills.

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