Hades Cup

In Kingdom Hearts, the Hades Cup is the fourth and longest-running tournament at Olympus Coliseum. After the cup, Phil puts up the trophy in the Lobby. There is a boss in every tenth seed, and after defeating each boss, your progress is saved so that you can continue from that seed even if you lose the cup.

In Kingdom Hearts II, the Hades Cup is a short tournament run by Hades, after the Underdrome is accidentally opened by Sora. Hades forces everyone to participate in the Hades Cup, including the weakened Hercules. Hades had stolen Auron's free will in order to force him to kill Hercules and Sora, but Sora manages to reclaim Auron's free will, and the heroes defeat Hades together. Much later on, Hades opens up the Paradox version of the Hades Cup, which has the traditional fifty seeds.