Minecraft wiki entry for Creating_a_challenge_map, associated text: If in multiplayer, a good idea is to have one player could be in the number room, and one could be in the question room. The one in the number room can tell the person in the question room the answer, and then the one in the number room is stuck but he can use the tp command to teleport to the one in the question room and carry on (this will only work if cheats are on).