A Reddit user posted a three-prompt architecture that turns any AI into a solo RPG engine. Persistent memory, dice mechanics, autonomous NPCs, faction politics, and a chaos system that evolves the world whether you engage with it or not.
What This Is
Most attempts at running an RPG inside a chat window fall apart within a few turns. The AI forgets your inventory. NPCs contradict themselves. The world sits frozen until you poke it. This system tries to fix all of that through structure rather than hoping the model stays coherent on its own.
The approach is three prompts that build, run, and interface with a layered simulation before a single dice roll happens. Each prompt has a specific job, and none of them overlap. That separation is what keeps the whole thing from collapsing after ten exchanges.
How the Three Prompts Work
Prompt 1 builds the engine. It defines three internal agents: a Narrative Director that handles story pacing, a World Simulator that manages factions and economic events, and a State Manager that compresses memory and maintains global consistency. This prompt doesn’t start the game. It sets up the machine. Think of it as loading the operating system before you open any application.
Prompt 2 runs the rules. Character creation, attribute distribution across Strength, Intelligence, Agility, and Charisma, HP calculation, weighted inventory, faction generation, NPC personalities with hidden agendas, and a full d20 action resolution system. Every turn follows a structured loop: update the world, describe the scene, show status, offer options, receive action, resolve it, apply consequences, update memory, advance time. The loop is explicit and consistent, which is exactly why the AI doesn’t drift. There’s no room for interpretation when the structure is this rigid.
Prompt 3 is the player interface. You fill in genre, tone, play style, and complexity level. From there you can redirect mid-session. Tell the system “more NPC interaction” or “raise the difficulty” and it adjusts without breaking continuity. This is also where you can layer in genre combinations before the game starts, which opens up more creative territory than most people expect.
The Two Features That Make This Interesting
The Chaos Factor runs on a scale of 1 to 9, starting at 5. Each turn, the system rolls a d10 against it. If the roll lands under the chaos value, a random world event triggers: a faction betrayal, an epidemic, an unexpected discovery. The higher chaos climbs, the less predictable the world becomes. The world doesn’t wait for you to drive it. This matters because it removes the “nothing happens unless I push” problem that kills most AI-driven narratives. A merchant guild can collapse between sessions. A war can start because of a dice roll you never even saw.
The Memory Card is a structured snapshot the system maintains throughout the session. Character stats, active missions, faction relationships, location, time of day, money. It compresses over time, dropping details that stopped mattering. The goal is keeping the AI coherent across a session long enough to actually feel like a campaign. Without something like this, most models start hallucinating inventory items and contradicting NPC names around turn fifteen. The Memory Card is the structural fix for that specific failure mode.
One Limitation Worth Noting
A commenter flagged something real: large prompts with heavy Markdown formatting tend to get partially ignored. AI models parse the beginning and end more reliably and sometimes skim the middle. The suggestion was switching to XML tags, which models read more consistently than stacked headers and emoji bullets. This tracks with how most frontier models are trained. XML is a deliberate structural signal; Markdown is closer to display formatting. If you’re feeding the model a 2,000-word prompt, you want it reading instructions, not skipping over a header it decided wasn’t critical.
If you’re testing this system, that’s probably the first thing to fix before running it.
Use Cases
- 🎲 Solo tabletop players who want a full session without needing a group
- Writers using RPG mechanics to generate unpredictable story branches
- Prompt engineers studying state persistence across long AI sessions
- Anyone prototyping interactive fiction or training simulations with AI as the engine
Prompt of the Day
This is the player initialization prompt from the system. Paste it after the setup prompts are loaded, fill in the brackets, and the game begins:
“I want to start a solo RPG.
Genre: [e.g. dark fantasy]
Tone: [epic / realistic / dark]
Style: [exploration / combat / narrative]
Complexity: [low / medium / high]”
You can also mix universes. Post-apocalyptic with medieval politics. Space opera with horror tone. The system is built to handle genre blending without collapsing. Most people default to a single genre because that’s what RPG templates suggest, but the architecture handles the extra complexity without needing any changes to the underlying prompts.
Bigger Picture
The RPG framing is just where this architecture showed up. Separating narrative, simulation, and memory into distinct roles is a pattern that applies beyond games. Customer onboarding flows, interactive product demos, scenario-based training. The same logic holds. Anywhere you need an AI to maintain state, respond to user choices, and evolve a persistent environment over multiple turns, this three-layer structure is worth studying.
If you want to see how far AI session coherence can actually stretch, this is a well-structured place to start. Drop the full prompt set in, make the XML switch, and see how many turns it holds together before the world starts contradicting itself.
Prompt: RPG Solo + Sistema + Entrada Usuario
by u/Ornery-Dark-5844 in PromptEngineering