UDE is a futuristic action/strategy game. In the game's main campaign, you can play as one of two races; the Tridalian or the Idatu. Your goal in each campaign is to destroy your enemy's base before your base is destroyed. You accomplish this by building structures, creating and commanding various units, and controlling your own unit. Structures and units require energy and crystals to build. Increase your crystal production by building mines and increase your energy by building power plants. If your hero unit is destroyed, it can be rebuilt. While alive, your hero gains experience every time an enemy is killed. Gaining enough experience will give you upgrade points, which you can use to upgrade your hero after each level.