A free app for Android, by Q42.

If you’re a fan of logic games, then the 0h h1 may be just what you’re looking for. This is the official, free app.

This logic puzzle is free, and without ads or locked content. You can play the game for free on your mobile device, and beat your personal best time in the game’s time trials. It has an easy-to-use interface.

But you can do better than that. If you love a challenge, you’ll want to unlock fun achievements and compete with friends on the game’s leaderboards.