This is an awesome puzzle game! It's like On The Ball on crack! It's wicked! I wasn't expecting much from it, since it only cost me $5 brand new, but it rocks! I got about halfway through it before I accidentally knocked the plug out of the wall and lost all my progress, which really sucks, because I was on some really evil puzzles and had managed to solve quite a few that were a royal pain to solve. So I'm not sure if I can stand to go through all that again yet. Anyhow, I started playing on Saturday morning and the next thing I knew it was Saturday night! So I was so immersed in it and hooked on it, I didn't even notice the time flying by. Not bad for only 5 bucks! So it's very addictive to say the least. Every time you solve a puzzle, you want to keep playing and solve another one. But it gets evil hard as you go along! There's 150 puzzles included, but you can design and save up to 50 of your own. It needs to come with a solution book though, because the more advanced ones seem impossible. I know there has to be a solution for all of them, but some of them are so hard you'll swear there isn't one. So it's a real brain bender! If you like puzzles at all, you have to get this game. It's incredible!