A third-person (with an optional first-person view) action game that places you in control of a variety of Mobile Suits and Mobile Armours from the Universal Century timeline of the Gundam media franchise that started in 1979. The game features both instant action modes and a campaign mode, as well as over 200 different Mobile Suits and Mobile Armours controllable by the player as well as additional units such as spaceships that can not be directly piloted by the player.
The campaign let's you create a character, assign them factions and use them throughout several different eras of the Universal Century. In the process of doing so your pilots level up and earn points that can be used to upgrade your vehicles performance.
If one has a friend one can also help one-another out in the campaign mode by using the adhoc function of the PSP. The game also supports regular player-versus-player multiplayer options.