"Dissidia Final Fantasy" is a fighting game based on the characters, themes, and other stupid things of the infamous Final Fantasy-game serie. It was created when the Japanese Life Sucking Mega Corporation Square-Enix was designing a new a sequel to their probably most selled FF-game, Final Fantasy VII. Unfortunately, Final Final Fantasy VII: Before Cerberus Crisis Children: The Story Behind Tifa's Boobs never got released when an idea of a a sequel to Final Fantasy IV was presented. As a compromise, Square-Enix decided to make a sequel to both games, plus to 10 other Final Fantasy-games. The game was titled as 'Dissidia Final Fantasy', which altough doesn't make any sense because 'Dissidia' isn't even a word.
The game's plot centers around two gods which have an arguement which they cannot settle. Cosmos, the goddess of Harmony, and Chaos, the god of... Chaos hires a bunch of heroes to battle instead of them.
edit Battle system
Dissidia Final Fantasy has propably the most unique battle system ever seen on fighting games before. It focuses mainly on a term called bravery. Bravery is the source of the characters powers, self-confidence and, well, bravery. To put it straight, the more you have it, the more braver your character is. The player can obtain more bravery by attacking the opponent with bravery attacks. That will also decrease your opponents bravery, until it reaches zero. When lowering zero, the opponent goes to the nearest beach to drink some lemon juice and eat ham sandwiches. That is explained as a break.
edit Final Fantasy Dissidia 012 [Duodecim]
"Final Fantasy Dissidia 012 [Duodecim]" is, as the name clearly states, sequel to Final Fantasy Dissidia. The name is very confusing, because Final Fantasy Dissidia 012 [Duodecim] is the second part of the serie, altough the latin word "Duodecim" means XII, which means twelve. Final Fantasy Dissidia 012 [Duodecim] is much better than the first part with many ways. Final Fantasy Dissidia 012 [Duodecim] finally has World Map, 8 new amazing characters and more moogles! Also, some versions of Final Fantasy Dissidia 012 [Duodecim] has a special ability to finally revive Aerith and use it as an Assist character! Cool!
FINAL FANTASY XIII MAKES FINAL FANTASY II LOOK GOOD