I love this game!! This is one of the best games ever for the 2600. I've got an emulator which I highly recommend (Stella 3.1.2 is the current version) to play this on. Boy, things get difficult once you reach 70,000, but once you reach 150,000, watch out!! The swirls begin homing in on you, and they get unpredictable!! I managed to turn the score over, and boy, it wasn't easy!! Very enjoyable, and it keeps you on your toes!!