Under Pressure is played in Niagara, with three players in the gunge chamber and one free player. At the opposite end of the room, three electronic counters display the pressure in the pipes above each team member, and the free player has to run to a button beneath the counter and press it repeatedly to take the pressure down. If pressure rises into the red zone, the valve above that team member will burst open and gunge them. Barriers are set up between the counters so the runner has to go back towards the near end of the room and back instead of staying at the far wall.

Believe it or not, this game was inspired by the pocket game "Mario's Cement Factory", where the player has to frantically stop four hoppers from overflowing.