The graphics are very good. There is a good number of easy and medium levels that I solved pretty quickly. There are no ads! However, you can buy hints.
What's different: some crystals have to be activated by more than 1 laser beam. Some squares must not be hit with a laser.
Many levels have boundaries so that pieces cannot travel just anywhere.
There are 100 levels and I have done them all. Although I admit I used hints for 2 of the problems. When using a hint, the game will show you 2 or 3 regions and you get to choose which region the pieces go. LaserBox offers a few hints for free.