How to Bring a Published Adventure Into a Solo RPG Session

Choose an adventure that can bend

A scenario built around locations to explore, clues to discover, or choices between competing goals usually gives you more room to make decisions than one that assumes a fixed sequence of scenes. Look for a clear starting situation and a few concrete leads. A dungeon with keyed rooms, for instance, can provide places and discoveries, while a journey scenario can offer destinations and obstacles.

Check the intended party size and character capabilities before you begin. If the adventure expects several characters with complementary skills, one hero may lack tools the scenario assumes are available. You can adapt by giving the protagonist a companion, adjusting challenges, or choosing a scenario that suits a single character. These are practical adaptations, not guaranteed fixes; a published adventure may still need significant changes to work solo.

For your first attempt, choose a short section or a self-contained adventure rather than an entire campaign. The goal is to test whether the scenario’s structure gives you enough decisions to play, without having to convert every plot thread up front. Some publishers make solo adventures that are explicitly designed for one player; Chaosium, for example, describes “Alone Against the Flames” as a solo scenario that teaches Call of Cthulhu rules during play. That illustrates the difference between a purpose-built solo adventure and a group scenario you are adapting. Chaosium’s Call of Cthulhu Starter Set

Read for structure, then stop

Before play, read the scenario’s introduction, character hooks, opening scene and any rules you need to understand its setup. Note the central situation in one sentence: “A courier has vanished on the road, and the village needs the sealed letter recovered.” That sentence is your compass when solo play generates an unexpected turn.

Avoid reading the solution, later scenes and concealed facts if you want to preserve discovery. If the scenario requires you to read ahead to understand a rule or a branching passage, do so deliberately and record only what your character could reasonably know. A solo player cannot unknow information already read, so a simple spoiler boundary is useful: keep future pages covered, use bookmarks, or prepare a short list of details you are allowed to consult.

Make a compact reference sheet with the opening situation, key names, places, visible leads and any deadlines or moving events. Don’t copy the entire adventure. The author Lynne Hardy’s advice for preparing a large published campaign recommends reading and planning ahead; in solo play, apply that idea selectively by understanding the structure you need while protecting specific reveals you want to encounter in character. Chaosium’s Keeper advice by Lynne Hardy

Separate fixed facts from unknowns

Sort your notes into three categories: established facts, facts your character has discovered, and questions that remain open. For example, the missing courier’s last known destination may be an established fact; the reason for the disappearance may be concealed; whether a witness is at home right now may be unknown. Keep those categories separate so your foreknowledge does not accidentally answer the character’s questions.

Preserve the adventure’s important facts when they are necessary for its premise or later scenes. Use the oracle for uncertainty around them: a guard’s mood, whether the innkeeper is available, or whether the trail is easy to follow today. A solo GM emulator can answer yes-or-no questions and introduce unexpected events. Mythic Game Master Emulator describes its oracle as testing expectations, with random events that can change the direction of an adventure. Word Mill Games: Mythic Game Master Emulator

Phrase each oracle question narrowly. “Is the innkeeper secretly responsible?” may reveal a major secret too early. “Is the innkeeper willing to speak with me?” creates a playable answer without deciding the mystery. If you have a strong expectation, use the oracle’s probability method or another procedure from your chosen tool rather than deciding solely by preference. The precise procedure depends on the oracle you use; Mythic and Ironsworn, for instance, have their own rules and tables.

Turn the scenario into a playable map

Draw a small flow map linking the opening to the people, clues and places your character can pursue. It need not reproduce every branch in the book. Mark a lead when it has a plausible connection to another scene, and note what information can be found there. This helps you see when your character has run out of useful directions without forcing them onto a single route.

Imagine the courier example. The adventure says the courier stopped at an inn before disappearing. Your character can question the innkeeper, inspect the stable, or ask a traveler about the road. The book may establish a muddy boot print near the stable; whether it is noticed could depend on the character’s search and the game’s normal rules. If the print is found, it points toward a bridge. The map lets you follow that lead without needing to read every later encounter in advance.

For each important clue, consider whether there is another route to the same essential information. Group adventures often distribute clues across several characters or scenes so the story can continue when players miss one. In solo play, use the scenario’s available alternatives where possible. If the book offers only one route and your character misses it, decide in the moment whether a new consequence or a different clue would keep the investigation moving. Treat that as an adaptation, and note it so you stay consistent.

Use your RPG’s rules for actions and consequences

Let your chosen game system handle character creation, skill checks, conflict, travel and other procedures it already covers. Use the oracle for questions the rules do not answer, such as what an NPC wants or whether a location contains an unexpected complication. Keeping those jobs distinct prevents every uncertain moment from turning into a new custom rule.

Published adventures can assume a party with a particular range of abilities. If a solo protagonist cannot perform a task as written, first ask whether there is another approach the fiction supports: persuade a local guide, find a tool, take a longer route, or accept a cost. If the game calls for a roll, use its ordinary procedure and let the result matter. Avoid repeatedly rerolling until you get the intended clue or outcome; doing so can erase the consequences that make the session responsive.

If you add a companion, decide what the companion can do before the session and keep their role limited. A guide who knows the road but not the mystery can help with navigation without taking over the investigation. This is a useful balance choice, not a published universal rule. Ironsworn, for example, is explicitly designed for solo, co-op and guided play and includes story prompts and tools for moving quests forward; if you use it to adapt a different game’s scenario, follow Ironsworn’s procedures for the mechanics you have chosen to use, rather than assuming that another system’s challenges convert automatically. Tomkin Press: Ironsworn Digital Edition

Let surprises alter scenes, not erase the premise

When an oracle or a failed action introduces a surprise, connect it to what is already happening. A storm could delay the search and force a choice of shelter; a helpful witness might offer a partial clue but ask for a favor; the trail could lead to an unexpected place. These turns make the published material respond to your character while leaving room to use its prepared locations and people.

If a surprise contradicts a fact you have already established, pause and check which source of information is more authoritative in your game. A random event may add an obstacle without changing the adventure’s central fact. If you decide that a genuinely important fact has changed, update your notes and consider what else must change with it. Don’t quietly preserve the old conclusion while acting as if the new one were true.

A useful boundary is to ask the oracle about the next decision, not the whole plot. “Does the witness agree to meet?” is easier to resolve than “What is the entire secret behind the disappearance?” Smaller questions create scenes you can play through, with room for character actions and game rules to shape what happens next.

A practical first-session procedure

Use this sequence to turn a published adventure into a session without preparing every possible branch:

This method keeps preparation small and gives you a repeatable way to handle uncertainty. It also makes adaptation visible: you can tell which elements came from the published scenario, which resulted from your character’s actions and which you introduced to keep the story playable.

When to change the plan

If you already know the adventure’s central reveal, a mystery may still be enjoyable as a tactical or character-focused challenge, but the discovery effect will be different. Consider changing the protagonist’s goal or focusing on a different thread instead of pretending you do not know the answer.

If a scenario repeatedly requires a full party, depends on scenes your character cannot access, or leaves you with no meaningful choice unless you read ahead, set it aside or adapt its premise more substantially. A solo session should give you enough information to choose actions and enough uncertainty for the outcome to remain in play. No oracle can make every group adventure fit every solo character.

You do not have to reproduce the published plot beat for beat. Keep the parts that make the adventure interesting to you, follow the game’s rules for character actions, and let unresolved details emerge through your chosen solo procedure. The result is a solo session shaped by a published adventure’s material while remaining responsive to what your character actually does.

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