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Collection of 39 single-player open-source logic puzzle games, free, no ads, playable offline.

See the screenshots for the full list of 39 different games. All generated on demand with adjustable size and difficulty, so you'll never run out of puzzles.

Various control options for small screens: on-screen arrow keys (can be enabled in Settings), pinch to zoom, and a button to swap press/long-press.

Beta testers welcome! Join future beta tests with the button on this listing.

Permissions:

NFC lets you beam a puzzle to your friend's phone, like this: https://youtu.be/nCw1ilMzCH4

Media permissions let you swap saved games with Simon's versions for other platforms at https://www.chiark.greenend.org.uk/~sgtatham/puzzles/ (via Save/Share actions)