1. The power source - it can rotate. Usually, it's fixed in place.
2. There's a time limit and move limit. For example, you have to solve the puzzle within 60 moves and within 2 minutes.
3. If you lose, a new level is generated randomly so you can't memorize anything.
4. Supposedly, something cool happens on levels 56 & 57. But I didn't get that far.
My advice for this game - as well as many others - let players jump around. Puzzle Gamers don't have time to play everything, nor every level of every individual game.
The graphics are good. And, there is a free version. If you've never played a pipe rotating game, give this a try.