15 Puzzle

15 Puzzle is a game let you immerse by arranging pieces of blocks, yes! 15 blocks, in a way of 1 to 15 in organized manner.
Encountering in situation , the block have no way of moving to a place , make you decide to rearrange like the beginning state again.
Once the block is in place. it will indicated by circle with different color. So try while you are:
-Waiting for the bus
-While in airport
-Or in clinic
-Some lonely time