The one trying the doors must be quick and slam the door before the danger on the other side emerges (or reaches out to grab them)! Riddles, such as Knights and Knaves, may play some part in the process of deciding which door is the one that leads to reward or safety rather than confusion or danger. More enterprising or less white hatted heroes may fudge against the rules a bit and find a more creative method to determine which door is the one they want. Sometimes the danger behind the doors is the villain who can do the Offscreen Teleportation trick and be behind each door progressively.