Dissidia: Final Fantasy is a 1v1 action game produced by Square Enix for the PlayStation Portable as part of the campaign of the Final Fantasy series 20th anniversary. Information on the game was first released during the "Square Enix Party" event of May 2007. The game features the hero and their foil from the first ten installments of the Final Fantasy franchise (although secret characters are available) and centers around a great conflict between the Crystals. The game itself has been expressed under the genre as "Dramatic Progressive Action" by Square, utilizing fantastic attacks based around the character's own abilities, physics-bending acrobatics like vertical running, with an emphasis on aerial combat as well, mimicking the high-flying action of the sequel CG movie Final Fantasy VII