The Poisoned Hall card in the Backrooms Trading Card Game poses a perilous scenario for players navigating the twisted corridors of the Backrooms. This card presents a hallway suffused with a lethal gas, painting an image of an eerily silent space where danger manifests not as a physical entity but as an invisible and insidious threat. Survival here hinges on preparedness - possessing a Gas Mask provides safe passage and the rewards of the card count score. Venturing without one, however, results in severe damage to the player's Deck in Hand, reinforcing the idea that the Backrooms can be as deadly as they are mysterious. Intriguingly, this hazardous environment can also turn into a tactical advantage during entity encounters, delivering additional damage to the adversaries, adding a strategic element that encourages players to weigh risks against potential rewards.