Click on a block to shift it to the empty space. When two blocks with the same value appears one next to another, these two blocks merge into one with the value of sum of these two blocks.
Merge all blocks to receive the value 2048.
Note:
Block has preferable directions to be shifted!
If there are several empty spaces around the block, it chooses the direction to move in such priority :
Top; Left; Down; Right.
