If you need a D&D-style game to calculate the check, choose a documented rules engine such as TableForge. In today’s AI Dungeon Dynamic Small Action-input fixture, a prompt that required an advantage choice, arithmetic and a success-or-failure verdict returned narration instead of those requested fields. This page compares who hosts and what a turn costs; AI Dungeon Master compares who can serve as your DM.
| Name | Type | Free allowance | What can interrupt a turn? | Best fit |
|---|---|---|---|---|
| TableForge | D&D rules engine with AI narration | 60 DM narration turns; up to 2 players. Official guide | The free turn pool ends; the campaign remains saved. Official guide | A solo player or duo that wants the engine to resolve rules. |
| Friends & Fables | AI GM with tactical maps | Up to 25 turns per day; 3-player campaigns on Free. Official pricing | The daily allowance counts GM replies. Official pricing | A small group that wants a map and daily allowance. |
| AI Dungeon | Free-form text adventure | No regular turn cap is stated in the usage policy. Official policy | Suspected excessive use can reduce or restrict access. Official policy | A player who wants open-ended narration and will check consequential rulings. |
| AI Game Master | Mobile text RPG with local and online play | Claim 5 free tokens every 4 hours with the receive button. Official guide | Each online player spends their own tokens; an empty balance blocks that player’s turn. Official guide | Phone players who want custom actions or a shared device. |
| DNDAI | Gem-based AI campaign game | Free to start; starting free gem balance is not stated on the public pages reviewed. Homepage | Taking a turn and continuing a game are listed as Mythic Gem uses; zero-balance behavior is not stated. Official pricing | A player who wants to inspect campaigns before buying gems. |
This table is arranged by selection criteria, not search ranking. Product information was rechecked on November 14, 2026 on the linked official pages.
What happened when a rules prompt met AI Dungeon?
On November 14, 2026, the Codex desktop operator opened AI Dungeon and submitted one Action-input prompt while the page displayed the model name Dynamic Small. The prompt supplied a success threshold, two advantage values, a skill penalty, a poison penalty, a required list of fields, and an instruction to stop before narrative. Its requested arithmetic was mechanically specified by the prompt: choose the higher value, apply both penalties once, then state the total and verdict.
The first returned paragraph did not name the selected die, show arithmetic, state a total, or state success or failure. It opened with: You are standing in the entrance hall of an abandoned mansion
; it later supplied two corridors and said that A 20-sided die rolls across the table in front of you.
Those are observations of this one returned paragraph, not a measurement of every AI Dungeon model or adventure.
The evidence page preserves the submitted prompt and full returned paragraph verbatim, together with the local screenshot. The session stopped immediately after that paragraph. No Retry, correction, follow-up Action, edit, alternate model, second adventure, combat sequence, subscription-tier comparison, or repeated sample was run. That boundary matters: this fixture shows what the selected mode returned once under a tightly written rules request; it does not establish an overall error rate or a product-wide rules capability.
To reproduce this limited check, use Action input, record the model name visible on your own screen, submit the exact fixture from the evidence page once, and compare the visible reply against the four requested result fields. Keep any later correction or retry in a separate record rather than treating it as the first reply.
How should a group choose before it starts?
Start with the state you need preserved. TableForge says its engine handles D&D rules while the AI narrates; its free guide lists a 60-turn pool and says the host subscribes while guests play free. Friends & Fables publishes a daily GM-turn allowance and a party size. AI Game Master documents individual online token balances. Those are different limits, so decide whether you need code-resolved rules, a daily shared rhythm, or each player’s own balance before inviting anyone.
For an unstructured solo story, AI Dungeon remains the free-form option in this table. The fixture above gives one reason to check a consequential roll yourself when the next decision depends on explicit arithmetic. It does not compare AI Dungeon with TableForge under a matched adventure, so it cannot rank their rule handling.
What should you verify before you invite friends?
- Who pays: TableForge says the host subscribes; AI Game Master says each online player spends their own tokens.
- What a turn consumes: Friends & Fables counts GM replies, while DNDAI lists taking and continuing a turn as Mythic Gem uses.
- Who resolves the check: ask whether the product publishes an engine that resolves the rule, then run one written fixture before a long session.
Evidence scope and increment
The dated field section above is the page’s new first-party material. Its claim map ties every statement to the saved prompt, first returned paragraph, screenshot, and stop point. The bounded increment calculation counts the field-observation prose against this article’s reader-facing prose; it does not claim a Google-top-ten or web-wide uniqueness result. Read the public evidence and claim map.