刷卡和合併兩個瓷磚同一號碼。
This is just a number game, easy to play. On start of the game you will have 4x4 tiles with random numbers (2, 4 or 8), and the next upcoming number b/w the same, when you merge the two numbers, target tile will be double and source will get the next number. On every successful merge next upcoming number will be changed randomly(2, 4 or 8).