Start of a run
Pick your hero
Choose who to descend with — the game is co-op for 1–4 players, so a solo run or up to three friends both work.
Ready when: Hero locked in before the first floor.
Undercroft Wiki
Build your deck, choose a route, and face bosses on a different descent each time. Play solo or with friends, and resume your saved run later.
Game Updates
1–4 Player Co-op5 Heroes300+ Cards30 Bosses
What one run down through Undercroft looks like, floor by floor.
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View Pick your hero - 2
View Fight and choose your way down Floor by floorFight and choose your way down
Win card battles for deck copies, relics and gold, and weigh the stops between fights — events, chests, the merchant, an Elite or a Challenge.
Ready when: The floor's fights and choices are settled. - 3
View Take your deck to what waits below Bottom of the descentTake your deck to what waits below
30 bosses guard the way down, and every descent ends with something waiting at the bottom.
Ready when: The bottom-of-the-run fight is decided — and your descent stays saved if you leave.
Explore the Wiki
Pick a guide category, check the codes list, or follow the game's update history.
What Is Undercroft: Deckbuilder Roguelike?
Undercroft: Deckbuilder Roguelike is a turn-based RPG on Roblox centered on replayable descents. Choose from several heroes and try different approaches as you push deeper, with defeat part of the roguelike journey.
See How a Descent WorksPlatform
Roblox
Genre
Turn-based RPG
Developer
NEVER GIVE UP!!!!
Inspiration
Slay The Spire 2
Latest Guides
The four ways your deck changes while you descend.
Add from fight rewards
Winning a fight can offer to add a copy of a card to your deck — take what serves your plan, and declining is allowed.
Reshape at floor events
One event offered remove-a-card and transform-a-card for 6 HP each; a separate trade sold gold for 4 max HP.
Upgrade mid-run
Upgrade prompts improve one card of your choice — one upgrade in a recorded Knight run cut a card's cost to zero.
Buy at the merchant
A merchant node mid-descent sells cards and relics; gold earned during the run spends here.
Who you can pick to descend with right now.
Knight
The hero confirmed selectable in recorded play; its starting deck includes the attack card Slash.
Cleric
Named in the scheduled update 'The Cleric Approaches', listed for November 16, 2026 — not confirmed playable yet.
Named cards from the Knight's pool and what's known about them.
Slash
The Knight's starting attack, played for damage in early fights; no exact value confirmed.
Guard
The Knight's starting block card, sometimes played twice in one turn.
Kick the Fallen
Obtained by transforming Slash; read at pickup as 'Plus two of each exposed'.
Scars
Read as 'enemy loses might this turn' during a run's opening choices — a zero-cost card.
What you do on your turn in an Undercroft card battle.
Play your cards
On your turn, play cards from your hand one at a time — attacks deal damage, Guard cards build block.
Sip a potion if needed
Tap a potion mid-fight whenever you need it; potions are free to use.
End the turn
Once you have played what you want, end the turn and the enemies take their actions.
Win the fight
Defeat every enemy to win, then take your post-fight card pick.
Rounds alternate until one side is finished — the loop repeats every battle.
What is confirmed about the fights waiting at the bottom.
Expect 30 boss fights
The official listing promises '30 bosses guarding the way down', and every descent ends with something waiting at the bottom.
Guard on the dangerous turns
In the recorded Rat King fight, guard cards came out on the big hits — back-to-back guard plays appeared more than once.
Keep pressure and spend potions
Attack cards kept up the damage while potions carried the player through; the win came after the last potion was spent.
Undercroft descents support 1–4 players.
1–4 players per descent
The official description calls it a 'co-op card roguelike for 1–4 players' — a party of one is valid.
Bring up to three friends
Take up to three friends into the same run and descend together.
Server cap is not party size
Roblox lists a 24-player server cap for the game — that is platform capacity, not your co-op party.
Frequently Asked Questions
Short answers to the questions players ask most about Undercroft: Deckbuilder Roguelike, each linking to the guide with the details.
Yes — descents are co-op for 1–4 players, and a solo run is a valid party too. Roblox's 24-player server cap is platform capacity, not your party size.Read the co-op guide
The Knight is the hero confirmed playable in recorded play, starting with the attack card Slash. The Cleric is named in the scheduled 'The Cleric Approaches' update for November 16, 2026 and isn't confirmed playable yet.See the heroes guide
Four ways: fight rewards can add a card copy, floor events remove or transform cards (6 HP each in one recorded run), upgrades improve a card — one upgrade made a card free — and the merchant sells cards for gold earned in the run.Read the deckbuilding guide
Yes. When you leave, the game saves your run, and you can continue the same descent at any time.See the saving progress guide
The store lists four revive purchases: Revive R$ 50, Revive everyone R$ 100, 5 Revives R$ 199 and 10 Revives R$ 349. Recorded prices are snapshots, so check the in-game store before buying.Compare revive prices
Ready for Your Next Descent?
Get oriented with Undercroft before choosing your next path into the depths.