Dissidia Final Fantasy is a video game developed by Square Enix for the PlayStation Portable as part of the campaign of the Final Fantasy series 20th Anniversary. Dissidia's genre has been described as "dramatic progressive action," featuring characters battling in a 3D environment with the ability to level up and customize characters.
The game unites twenty characters from the original ten installments of the Final Fantasy series, along with two secret characters from later games. Chaos makes an appearance as the god of discord, while a new character, Cosmos, appears as the goddess of harmony. Each of these gods has summoned ten warriors to fight for them against the opposing god. Now, Chaos and the villains have seized control of ten Crystals and wounded Cosmos, and the heroes must recover the Crystals to restore Cosmos and prevent control of the worlds from falling into evil hands.