Chaos is the sixth and last of the Duel Worlds in Yu-Gi-Oh! World Championship 2008.
The player will see two parts of the world, above and beneath.
Above[]
Chaos (above)
Several Duel spirits await the player, as usual.
- Evil Hero Malicious Edge (unlocks Evil Hero Infernal Gainer)
- Destiny Hero - Plasma (unlocks Destiny Hero - Disk Commander)
- Elemental Hero Neos Alius (unlocks Neo Space Pathfinder)
Beneath[]
Chaos (beneath)
Several Duel spirits await the player, as usual.
- Cyber End Dragon (unlocks Cyberdark Dragon)
- Green Gadget (unlocks Ancient Gear Gadjiltron Dragon)
- Horus the Black Flame Dragon LV8 (unlocks Sacred Phoenix of Nephthys)
Stone Monument[]
Above Stone Monument
If the player beats all Duel spirits in the above area at least five times each, a stone monument will appear. The stone monument has a carving of "Elemental Hero Chaos Neos". In order to unseal it, the player need to Summon "Elemental Hero Chaos Neos" and win the Duel. If they do, Jaden Yuki will be unlocked in World Championship Mode.
Beneath Stone Monument
If the player beats all Duel spirits in the beneath area at least five times each, a stone monument will appear. The stone monument has a carving of "Armityle the Chaos Phantom". In order to unseal it, the player need to Summon "Armityle the Chaos Phantom" and win the Duel. If they do, Yubel will be unlocked in World Championship Mode.
If the player clears six stone monuments (across all Duel Worlds), Joey Wheeler will be unlocked in World Championship Mode. If the player clears all seven stone monuments (across all Duel Worlds), Yami Yugi will be unlocked in World Championship Mode.