You're referring to the classic game UFC 3: Undisputed, a legendary mixed martial arts fighting game.
Since there is no official "2021 Edition" of UFC 3 (the game was released in 2018), this refers to a popular community-made Roster Mod. These mods are created by the community to update the game with new fighters, updated stats, and new weight classes that weren't in the original game. ufc 3 undisputed mod 2021
(Xbox 360), modders have bridged the gap between the classic simulation gameplay of the THQ era and the current era of UFC stars. Key Features and Modernization You're referring to the classic game UFC 3:
Integration with tools like Parsec to facilitate remote competitive play. How to Access ufc 3 undisputed mod 2021