iPhone and iPad owners' latest gaming addiction is now available on Android. Threes, which has been out for just over a month on iOS, is launching today on Android 4.0 and above for $1.99. The deceptively simple puzzle game has players sliding together numbers to create larger ones until they fill up a grid, so players are only ever competing to beat their own (or maybe a leaderboard's) high score. The Android version, which was ported for developer Sirvo by Hidden Variable Studios, appears to be identical to its iPhone counterpart, with both featuring a playful and colorful style that makes the game a joy to play. If you buy it, just make sure that you have time for a few rounds — it can be hard to put down.