You can choose two modes, jigsaw or sliding. On jigsaw mode you should drag the pieces into right position. Multiple pieces can be selected using Ctrl + Left Click. You can choose one of four modes: easy, medium, hard and expert. But watch out on time, if it runs out you will lose! On sliding mode you should drag the pieces and make this puzzle. After finishing puzzle, you can play again. Every next time is more difficult. Have fun!