Here is another installment of exTRAPaganza, our Thursday over-the-top trap series.
This enormous room has a wall full of valves. All over the room, steam escapes from nozzles on the floor. The steam is hot and burns. Each wall valve closes a nozzle. However, if more than half of the nozzles are closed (required to safely traverse the room without damage), the pressure build up below cause the floor to explode in 1d4 rounds.