How do you enter Olympus coliseum in kingdom hearts 1

Eventually the chipmunks on the Gummi ship will tell you there is a tournament at Olympic Coliseum. Until then just keep on going to different worldls and continue with the story. When they do, you talk to Phil and enter the tournament. There's the Pegasus Cup, Phil Cup, and Hercules Cup. they are all unlocked at different times, and the chipmunks will tell you when. You have to beat one to unlock them, like rounds. There is also a Hades Cup, i believe. The first one is Phil Cup, the Pegasus, the Hercules, then Hades (i think).