I like puzzles that make me think, and turn-based puzzles like this one fit the bill - no timers, no opponent, just me and the puzzle. Several good points - the puzzle rotates so you can play it in either orientation (portrait or landscape) - the puzzle moves around with a finger flick (the puzzles are normal sized, no squinting, trying to see tiny little playing pieces) - controls are easy to use. My only real complaint is about the music - no way to turn it off!!!! After 2 puzzles I was ready to stick an ice pick into the speaker. I ended up covering it with my thumb.