Simon Tatham's Puzzles – 2015-07-19-1841-5e1c335

Collection of 38 single-player open-source logic puzzle games, free, no ads, playable offline. All generated on demand with adjustable size/difficulty, so you'll never run out of puzzles. NFC lets you beam a puzzle to your friend's phone, like this: Media permissions let you swap saved games with the versions for other platforms at. Gd/sgtpuz