How do I unlock all 2 player racing levels on sonic adventure 2?

Collect all the balloons and defeat wizpig and earn the trophies for all four worlds then go near the beach world notice the trophy board touch it with your vehicle and you will fly to space here you must get the rest of the balloons and beat wizpig again and get another trophy that's how you get adventure two it will be available when you choose adventure. Psst go to options and go to magic codes type in jointventure to play a 2 player adventure mode.