Surprised no one has mentioned the obvious choice: Iron Maiden Pro. It's like Metallica but upgraded with 2 extra flippers, 2 spinners, color changing LED's in inserts, an HD Color LCD and stereo sound. Both games have excellent rule-sets but Maiden feels less like chopping wood. Maiden also has lots of great modes besides just the CIU modes. Metallica is a good choice but Maiden is a great choice!