This game is a great mashup of Tron and billiards, with a fun wind-up toy thrown in. I really like how the walls in the facility act like the diamonds on a billiards table, so if can do your angle calculations (or if you have spent some time with "Donald Duck in Mathmagic Land"--do kids in schools still watch that?) you can figure out how to solve the puzzle. Gameplay was smooth and intuitive. I wanted Err to succeed in his mission, so the game had me interested enough to keep playing. Thanks for the fun!