Outline is a setting-agnostic rules-lite TTRPG system built for low-prep sessions and solo play.

The system contains a fairly streamlined set of core rules that keep things moving fast, while being easily hackable. This guide has a few optional modules near the end that allow for some extra depth.

Who is this for?

You might enjoy Outline if you are:

• A GM that prefers low-prep, improvisational games.
• A player that enjoys a narrative-first approach.
• A solo player with a preference for rules-lite systems.
• A creator that wants a simple system as a base for your games.

Attributions

Outline is a highly derivative system. It takes inspiration from a variety of games, such as:

• Blades in the Dark, by John Harper.
• Into the Odd, by Chris McDowall.
• Whitehack, by Christian Mehrstam.
• One Page Solo Engine, by Karl Hendricks.

License

Outline RPG © 2026 by Celine Vieira is licensed under CC BY-SA 4.0