It is important to search your surroundings in order to find hidden doors.
<555h 100m 100v> exits Obvious exits: north - An unknown passage west - A hallway corridor > look south You see nothing special to the south. > open the door south There is nothing by that name to open. > search You search your surroundings. > You found 'the door' south from here. > exits Obvious exits: north - An unknown passage west - A hallway corridor (south 'the door') (hidden) > open the door south You push on the door in an effort to get it open. >