The Stars Room is one of the unlockable minigames accessible from the Scores Room. To unlock this room, earn a Gold trophy score for kills in a single game. Gold trophies require 120 kills, Silver trophies require 100 kills and Bronze trophies require 80 kills. If you are having trouble with reaching the kill threshold, consider killing the final boss extremely slowly; the weak mobs he summons after stomping will count towards your total.