The Keeper improvises
An AI Dungeon Master narrates live — conjuring rooms, monsters, schemes, and the worst possible NPC at the worst possible moment. It runs the story, not the math.
Grimecrawl · AI co-op dungeon crawl
Critfall Tales
An AI runs the table. The dice do not lie.
A 2–4 player co-op dungeon crawl run by an AI Dungeon Master — the Keeper. Dark-comedy heist, in a city that owes everyone money.
Browser demo — coming soonJump to the demo
The demo
Play in your browser.
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The table is being set.
Coming soon — the playable build will live atplay.critfall.com.
How it works
An AI tells the story. The dice tell the truth.
The magic of a great DM with none of the mercy. The Keeper owns the fiction; a cold, deterministic engine owns the outcomes — and the two are never allowed to collude against the rules.
A deterministic engine owns the dice
Every die, rule, and outcome belongs to code, not the narrator. The Keeper can’t fudge a roll to save you — or to spare itself. Honest dice.
A nat-1 really kills you
No invisible safety net. The story bends around the result; the result does not bend around the story. That is exactly why a clutch roll feels earned.
The setting
Welcome to Grimecrawl.
An underground debt-city beneath a forgotten mountain, lit by fungus-lamps and the cold glow of accounting. Here debt is literal law: the Ledger of Debts is binding, and the goblin-run First Bank of Grime owns everyone in red ink. You came down to pull off a heist. Statistically, you’ll leave owing more than you arrived with.
The Firm
Management. They own the Ledger, the Bank, and your immediate future. Smile back.
The Sump Syndicate
Old debt, deep tunnels, longer memories. They were here before the interest rates.
The Unwritten
The off-ledger. People with no entry, no number, and nothing left to repossess.
Tone: gallows humor, customer-service horror, mostly bloodless. The scariest thing in the dungeon is a clipboard.