The Underdrome is the Underwold counterpart of the Olympus Collisium. It is where all tounraments are fought in Kingdom Hearts two.
It was closed down and locked up by Zeus. It was reopened when Sora opened the lock during his first visit to Olympus Collisium. The different tournaments you can enter are:
- Pain and Panic Cup
- Cerberus Cup
- Titan Cup
- Goddess of Fate Cup
There are also the Paradox Cups.
- Paradox: Pain and Panic Cup
- Paradox: Hades Cup