gabrielecirulli/2048 — pull request #159 by Pyrolistical (2014-04-17 05:31:55+00:00)
Title: added a scaling factor to allow the game to go on forever

it starts spawning 4 tiles after you get at least a 2048 tile and have no more 2 tiles on the board.

then starts spawn 8 titles after you make at least a 4096 tile, etc, etc, etc