Hades Cup

The Hades Cup is the fourth, final, and longest-running tournament of Olympus Coliseum in Kingdom Hearts. To unlock this tournament you must unlock the Phil Cup, Pegasus Cup, Hercules Cup and seal the Hollow Bastion keyhole. Sealing the keyhole also unlocks the optional Platinum Match against Sephiroth. Completing the Hades Cup will earn Sora the Trinity Limit, one of his most powerful abilities, and open up the Gold Match against the Ice Titan.

In this Cup, your progress is automatically stored every 10 rounds, even if you lose and are kicked out of the Coliseum. Just like the other cups, there is also an option for Sora to go through on his own, and a timed trial with a 20-minute limit. Completing the Hades Cup under each of these conditions grants Donald and Goofy's ultimate weapons, Save the Queen and Save the King.

Rounds
There is also a Hades Cup in Kingdom Hearts II. This opens during the "Worlds Revisited" part of the adventure. The Cup consists of fighting various Heartless and Nobody enemies and culminates in a boss battle with Hades. In the battle, Sora and the gang are helped out by Hercules, who can become a party member.