---
title: "Undercroft - s&box game"
description: "Asymmetric dungeon battle: one keeper builds traps and monsters, up to three heroes raid it to break the seals."
canonical: "https://sbox.watch/games/twilight/undercroft/"
generated_at: "2026-09-15T10:41:07.151Z"
---

# Undercroft

Asymmetric dungeon battle: one keeper builds traps and monsters, up to three heroes raid it to break the seals.

- Type: game
- Ident: twilight.undercroft
- Creator: twilight
- Canonical: https://sbox.watch/games/twilight/undercroft/
- Markdown: https://sbox.watch/games/twilight/undercroft/index.md
- sbox.game: https://sbox.game/twilight/undercroft/
- Game jam: [Game Jam III](https://sbox.game/jam/three) entry; deadline Sep 25, 2026
- Generated: 2026-09-15T10:41:07.151Z

## Stats

- Playing now: 1
- 24h player peak: 2
- 24h momentum: +0
- Terry score: 25%
- Favorites: 1
- Upvotes: 2
- Downvotes: 1
- Total players: 4
- Total sessions: 12
- Cumulative playtime: 3.8 hours
- Updated: Sep 15, 2026
- Created: Sep 15, 2026
- Size: 44.6 MB
- Files: 184
- Tags: asymmetric, basebuilding, dungeon, dungeonkeeper, fantasy, gamejam, heroes, keeper

## Description

Undercroft

One dungeon keeper. Up to three raiders. One more round.

Undercroft is an asymmetric multiplayer dungeon game for 2–4 players. One player is the Keeper: they build the dungeon, hide the traps and command the creatures. The others are Heroes who raid it for seals and gold.
The Keeper builds

- Design the dungeon: paint walls and doors with a brush and choose where the corridors lead.
- Run the economy: workers mine gold veins, carry it to storages and build every order you place, so a plan takes time.
- Hide the traps: spikes, wall-mounted arrow traps, portcullises that cut the squad in two, and signal flares. Link them to pressure plates, tripwires or doors. Heroes don't see a trap until they spot it.
- Command the creatures: ghouls, skeleton archers and golems wander, patrol or guard, and dens keep releasing spawn along a route you set.
- Watch and deceive: during a raid you only see heroes through your creatures, workers and buildings. Decoy chests give away whoever opens them.
- Walk the dungeon yourself: your avatar fights beside your creatures and Roar calls them to your side.
- Grow your power through the Keeper tree: Avatar, Beasts, Traps and Cunning.
- Save your best layout and load it in the next match.

The Heroes raid

- Three classes:- Warrior: Dash and Challenge.
- Ranger: a Signal arrow that reveals traps, and Knee Shots.
- Mage: Barrier, a fireball that hits everything around, and Spirits that set off traps for you.

- Break the seals: hold E next to a seal while your squad covers you. A hit on the holder knocks the progress back.
- Hire creeps to fight beside you, then order them where to go and what to attack.
- Get your loot out: gold and gear only count if you leave alive. Fall back in time or lose it all.
- Prepare between raids: buy gear and potions, share a stash with the squad, learn skill trees and vote on which entrance to take.

One more round

Between raids both sides spend what they earned: the Keeper rebuilds, the Heroes gear up. Break every seal and the core opens. If the core survives every round, the Keeper wins.

- Fast mode: a match of about twenty minutes.
- Classic mode: long raids on a big map.
- Tutorials: one for each side.
- Languages: English and Russian.

Made for s&box Game Jam III.
Credits

Music
- "Dark Shrine Loop" by qubodup, a remix of "Shrine" by yd (CC0, OpenGameArt)
- "Dark Cavern Ambient" by Paul Wortmann (CC0, OpenGameArt)

Sound
- "RPG Sound Pack" by artisticdude (CC0, OpenGameArt)
- UI sounds by Kenney (CC0), bundled with s&box
- Impact, footstep and effect sounds from the s&box sound library

Art: hand-drawn by sakusato84
Game: D@niil

No AI was used to create the art, sound effects or music.Early development

Undercroft is in early development. We're a team of two, so the balance hasn't been properly tested yet. Some strategies may be too strong, some numbers are off, and some matches will feel unfair. Tell us what you find, especially what felt broken or impossible to beat, on the forum. Every match you play helps us tune the next update.




## More by twilight

| Package | Ident | Players | Favorites | Upvotes | Score | Markdown |
| --- | --- | --- | --- | --- | --- | --- |
| Overgrown | twilight.overgrown | 0 | 5 | 9 | 51% | https://sbox.watch/games/twilight/overgrown/index.md |