A simple to understand concept like this makes the puzzles quick and fun to play! I felt that some puzzles could be cheesed a little by putting my little light buddy up against a block so that their light got blocked almost 180 degrees. I think that might be a tough one to balance out though, you'd need working mirrors or transparent blocks or something. Either way it didn't take away from the lighthearted fun that this game provides. I liked it!