I love this series. The puzzles may seem very easy at first, but believe me they do get much harder. There are over 300 puzzles and I have been playing for over 2 weeks so far. The goal is not only to complete the puzzles, but IN THE FEWEST MOVES I also like the fact that you can submit your score globally and see how you stack up. The hint system too is good. I often used it just to check my first moves to make sure I was on the right track. You can use it for as man or as few moves as you want. It is also a game where you can play, stop for a week and pick right up as each puzzle is individual. I find it totally addicting and must work at each one till i figure out the fewest moves!