ChessLock is a one-of-a-kind screen lock for Android devices that replaces traditional locking mechanisms with a fun, interactive experience. You can either program your own chess moves or solve mate-in-one puzzles to unlock your phone. There are three different modes to choose from: Sequence, Puzzle, and Famous Moves. For additional security, every mode requires a recovery 4-digit pin password in case you forget your moves.

In order to guarantee that your phone remains locked, the app requires primary permissions to access your phone and gallery, and secondary permissions for accessibility service and draw over other apps. Once you disable your pre-existing lock screen and grant the necessary permissions, you will have access to a customizable board and pieces, as well as wallpapers and a sound and vibration toggle.

Whether you're a chess enthusiast or just looking for a unique way to secure your phone, ChessLock is the app for you. It's free to use, but you can upgrade to the premium version to remove ads, unlock all blocked items, and access the entire puzzle library. Plus, it works on tablets too!