Themed room filled with sand which contains either a couple long worms, or baby long worms if regular ones are not appropriate depth yet.

Add a themed room that contains an engraving explaining a random one of the game’s predefined alchemy recipes, and possibly one of the potion ingredients. The idea of this is to provide unspoiled players (or spoiled players who are out of date on alchemy changes) with an in-game means of learning the recipes.

A themed room that is a dragon’s hoard: a big pile of money and gems (and possibly a couple chests) spanning multiple spaces with a single sleeping (or waiting) dragon on top of it all.

Themed room named “Home Sweet Home” - one that a former adventurer has retired in and made their own. There is a peaceful player monster inside, and some trappings of home life such as a sink, a chest, food, and so on. If beds as a dungeon feature exist, there is also one of these.

Add a themed room commemorating the long-lived tactic of pudding farming. It has the following properties:

• It is a huge room, possibly a variant of the “Huge room” themed room with no subroom.
• On one space in the middle of the room is the pudding farmer, a random player monster.
  • They generate at level 15-30, as they do on the Astral Plane, but don’t have the same equipment as they would get on the Astral Plane, just the regular gear a player monster would get. Possibly some nicer gear under the assumption they’ve farmed it off the puddings.
  • They are hostile to the player, unless of the same role, in which case they are peaceful.
  • The pudding farmer also carries a thoroughly rusty -3 knife or stiletto, their Puddingbane, though it is not named as such.
  • Messages and farlook show their name as having replaced their rank title with “Pudding Farmer”, e.g. “Fred the Pudding Farmer”.
• The remaining spaces in the room have some reasonably high chance of spawning a black pudding, with varying degrees of reduced current and maximum HP.
• There may be a sink somewhere on the room’s floor, from which the initial pudding came.
• No globs of pudding on the floor from already-killed puddings; the thematic thing would be to have pudding corpses, which no longer exist in vanilla. Globs would imply the player monster has been pudding farming in NetHack 3.6 or later, which doesn’t make much sense.
• The minimum level difficulty of this room is 4, though that seems awfully low given how dangerous it’s likely to be. It could be based on the difficulty of black puddings, such as the difficulty of a black pudding + 3.
• One option to cut down on the gimmickiness of it is to have the corpse of a player monster, possibly with some gear, but not the player monster themselves, implying they slipped up and fell victim to the puddings.
• Since it was possible to pudding farm brown puddings in earlier versions of NetHack, there could be some chance that this room consists of brown puddings instead, which could then appear at a slightly lower difficulty and would lack a sink. Though this would be strange in the above case of there being a corpse rather than a player monster, since brown puddings cannot deal damage (maybe they choked?)

“Bowling alley” themed room, a fixed size (either 5 in width or height, longer in the other dimension) with six statues arranged in a triangle at one end of the room as “pins” and one or more rolling boulder traps for the “ball”.

Minesweeper implemented as a themed room: a certain fraction of spaces (probably 10% or less) have a land mine placed on them. Every space adjacent to a land mine bears an engraving of the number of adjacent mines; mines themselves are engraved with “X” or “BOOM”. Spaces with no mines adjacent have no engraving.

“Organic” anthole themed room: instead of using a rectangular room, it disrupts its edges so as to not look manmade. Then the room type is specified as anthole to stock it with ants.

“Dragon hoard” themed room: containing a big pile of gold scattered within a radius of 2-3 tiles around its center point, with larger stacks of gold closer to the center of the pile. The pile may also contain a few additional items: random gems, a ring or amulet, (if in an object-materials-implementing variant) a gold version of an item that is eligible to be gold. Atop the center of the pile is a dragon, or possibly a few adult dragons all of the same species, either asleep or flagged as waiting, with possibly a few dragon eggs of the same species and/or a couple baby dragons.

Dungeons levels generate random, small Sokoban “rooms” - actually themed rooms, never on a path between the two stairs, possibly using “diagonaloban” rules which permit boulders to be rolled in any direction. There is a minor prize in each room at the end of the puzzle.

Internally, rooms like this should have their own room type, which will help with putting in anti-cheating measures:

• You cannot teleport into a square whose room type is this room. (Teleporting out of the room should be fine.) Likewise, the room is not a valid destination for arriving on the level via levelport, falling from above, etc.
• The walls are nondiggable and non-phaseable.
• Air currents are in effect over pits/holes in this room type.
• The room should have a narrow entrance with a bend in it, so that boulders can’t be pushed in from elsewhere on the level.

It’s unclear what the methods to prevent the standard forms of cheating (breaking boulders, reading scrolls of earth, carrying boulders as a giant, etc) should be. Possibly they will just carry cheating penalties like normal.

Add “jackal kills” as a feature or themed room that generates rarely on early dungeon floors: a corpse of a playable race surrounded by a few jackals. If fake bones piles are added, make this a fake bones pile with “killed by a jackal” on the headstone.