I really wanted to love this game.It was fun and kept me busy.BUT,I kept on playing it,waiting for it get more challenging(almost 3,000 puzzles)but,NOPE.There are less than 10 various "pieces" to manipulate throughout the game,and once you've basically figured out how they interact,that's it.The puzzles just shuffle these pieces around from one to the next,but they're still basically the same.It would be easy to add more pieces,or obstacles...SOMETHING.Only gave the 2nd star because it WAS fun.