Fours! inspired by 2048
Inspired by the game 2048: http://gabrielecirulli.github.io/2048
New rules are introduced in the game. Swipe with your finger to move numbers between tiles. 1 and 3 merge into 4. Two tiles with the same number greater than or equal to 4 merge into one. The goal in the game is to get to 1024 tile.