History
The Cosmic Game Room was a satellite base of operations of the Grandmaster from where he and the Challenger oversaw the contest between their teams, the Lethal Legion and the Black Order, respectively.[1] From the Cosmic Game Room, the Grandmaster and the Challenger activated the Pyramoids, whose purpose was to be seized by either team to score a point.[2] When somebody touched a Pyramoid, they were teleported to the Cosmic Game Room and remained encased in a crystal.[3]

See Also
- 14 appearance(s) of Grandmaster's Cosmic Game Room
- 5 minor appearance(s) of Grandmaster's Cosmic Game Room
- 4 image(s) of Grandmaster's Cosmic Game Room