Fifteen

Developed by Pedro Izecksohn.

1 2 4 7
D _ A 8
E 5 6 F
9 3 C B

Fifteen

1 2 4 7 D _ A 8 E 5 6 F 9 3 C B

1 2 4 7
D _ A 8
E 5 6 F
9 3 C B