A Good Dog - 15 Puzzle is the classic 4 x 4 puzzle with numbers, letters and a bunch of beautiful picture themes. It also includes two additional puzzle sizes (3 x 3 and 5 x 5). Move one piece at a time by sliding it into the empty slot, until all the pieces are in the right order. Choose mode 3 x 3 for beginners and 5 x 5 for advanced players.