Betract is described as 'puzzle game that will bend your mind. Simply add the numbers while trying to avoid subtractions!'. There are more than 25 games similar to Betract for a variety of platforms, including Android, iPhone, iPad, Android Tablet and Online / Web-based. The best alternative is 2048, which is both free and Open Source. Other Betract like games are Threes! (Paid), 2048 by Uberspot (Free, Open Source), colorszzzx (Free) and numb, number & numberer (Free).
2048 Cubed (3D) - Yet another clone of 2048 but in 3D. Slide the 2 cubes with the same number to form new cubes and try to reach the 2048 cube! Swipe across the screen to move cubes up, down, left, right, forwards and backwards in this addictive game.