The player's avatar can be created on one of two factions, the Principality of Zeon or the Earth Federation Forces, each with their own unique cities, vehicles, and Mobile Suits.
In order to combat enemies, players must "lock-on" to their enemies and initiate attacks, but all attack, dodge, shield block, and miss rolls of the weapons in the game were done automatically through dice rolls, as typical with other MMOs.
The game takes place in the Gundam Universal Century universe, more specifically the One Year War period, though most of the MS, MA, and vehicles in the game are featured from the Mobile Suit Variations publications, 0083:Stardust Memory and elements of Mobile Suit Zeta Gundam.
The progression of the game was hinting towards moving into the Zeta era of the Universal Century, however with the shutdown of UCGO, the players may never know.
Players were able to choose between four cities on each faction on the continent of Australia and in a limited zone in space around the Earth.
These "limbs" would then introduce "detriment effects" such as every other fantasy MMO has, but the original UCGO and other emulated versions never did.