The Sentinel Combat Challenge is a minigame in the Sentinel vendor area of Nexus Tower. The challenge is for players to deal as much damage as they can to a series of target dummies over a 30 second period. Like every other minigame in LEGO Universe, Green Imaginite is required to play. When the minigame begins, the timer starts counting down from 30, and Target Dummies appear in front of a simulated backdrop of one of the LEGO Universe worlds, such as Gnarled Forest.