Free Shisen Sho is an ad-free, open-source puzzle game developed by knilch0r for Android devices. The program does not use any extra permissions on your Android device and does not display any ads. It is a fork of the already existing implementation from "proofofconcept" available at Google Play Store. The game is designed for those who love to solve puzzles and want to play them on their Android devices.

The game has an adapted layout for big screens, persistent settings, and highscores. The program uses Github instead of Dropbox. The game is perfect for those who love to play puzzle games and want to enjoy them without any distractions. It is available for free, and the game is licensed under open-source, so you can modify and use it as per your requirements.