Play Lazer Maze by bouncing lazer beams off of mirrors to hit goals. Activate buttons, open doors, and avoid walls. On foggy levels the lazer beams fizzle out, but in a vacuum the beams are invisible. Remember the rules of optics as you reflect lazers around and create superpositions with negative-feedback loops and partially reflective mirrors.
For extra difficulty, go for the challenges. Play all 48 levels, sync across iCloud, and connect through Game Center, Facebook, and Twitter.