A closet is a single square located behind a door. Often the door is a secret door.

Closets are referred to as niches in the source code[1].

Sometimes closets are generated without doors leading to them. The only way to get to these is for a corridor to be generated adjacent to them, or to teleport or dig in. Such closets always have a scroll of teleportation inside, and a potion of object detection will reveal its presence. Every closet has either a door or a scroll of teleportation.

There is sometimes writing in the dust outside. The engraving ad aerarium (from the Latin "to the treasure") indicates that the closet contains a vault teleporter, and the engraving Vlad was here indicates that there is a trap door inside. On deeper levels, a closet marked with ad aerarium may have a level teleporter instead. This is a pun on a secondary meaning[2] of "aerarium" as sky.

Monsters can be generated inside closets just like on any other square.


  1. mklev.c, line 462
  2. not present in several Latin online dictionaries
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