Pic-A-Block

For a small developer and a small price tag, Pic-A-Block delivers dozens of brain teasing slide-puzzles. It's not deep but it can make you feel occasionally clever. I would've liked a few more options around colour palettes and undoing moves but it's fine and functional. I find the music relaxing and, provided you're playing in short bursts, it's not going to outstay it's welcome.