The object is to hit the purple targets. Duh.
Here's what's different:
1. You get to choose the starting point along any point along the perimeter.
2. On some levels there is a dexterity element, which we've never seen before in a laser puzzle app. Look at the second image. There are 2 targets, but you first must activate them by passing through the red things. Solution: The start point is somewhere on the left edge. Then, when the beam gets almost to the right edge - tap the screen. The beam, heading east, will split into 2, one going up, one down.
There are 25 free levels and I've done 24 of them. After that, you can buy more.
I like this puzzle concept. I'm not crazy about the graphics.