What System Does Stars Without Number Use?
Short answer
Stars Without Number uses its own old school ruleset, descended from classic d20 fantasy rather than licensed from another game. Six attributes, classes, backgrounds, and foci, with its own saves and skill list.
Stars Without Number uses its own ruleset, written by Kevin Crawford in the old school tradition and clearly descended from classic d20 fantasy rules rather than licensed from a modern system. Characters have six familiar attributes, a class, a background, and foci. It is not Powered by the Apocalypse, not d20 Modern, and not a Year Zero or 2d6 trade game system, though it sits comfortably beside all of them on a shelf.
The pieces a new player will recognise
- Six attributes with modifiers.
- Classes, with levels and hit dice.
- Armour class, attack rolls, and saving throws.
- Fragile low level characters and fast combat.
The pieces that are specific to it
Backgrounds and foci. A background covers where the character came from and what that taught them. Foci are packages of specific competence, and they are where most of a character's distinctiveness lives. Two soldiers with different foci play very differently.
Skills are rated as levels rather than as accumulating points, which keeps the sheet small and the maths quick.
What the system is actually optimised for
Sandbox campaign generation. The player facing rules are deliberately light so that the GM facing tools can be heavy. Sector generation, world tags, faction turns, and adventure seeds are the parts of the book doing the most work, and they are what most people mean when they say Stars Without Number is a great game to run.
Is it OSR?
Yes, in the sense that matters: it shares the design assumptions of old school play, including lethality, player skill over character build, and the expectation that the GM is generating a world rather than following a plot. It is not a retroclone of any specific edition.
Our Stars Without Number tabletop implements these structures directly, so the sector, the factions, and the ships are records the tool understands rather than notes you maintain.
This product is an independent product compatible with Stars Without Number by Kevin Crawford / Sine Nomine Publishing. Stars Without Number is the property of Sine Nomine Publishing. This product is not affiliated with or endorsed by Sine Nomine Publishing.
Related questions
- Is Stars Without Number d20 based?
- It is descended from classic d20 fantasy design and uses recognisably similar structures like attributes, classes, armour class, and saving throws, but it is its own ruleset rather than a d20 licensed product.
- Is Stars Without Number an OSR game?
- Yes. It follows old school design assumptions including lethal combat, player skill over character optimisation, and GM driven world generation, without being a retroclone of a specific edition.
- Do I need to know old D&D to play it?
- No. The rules are self contained. Prior old school experience helps a GM more than it helps a player, mainly in setting expectations about lethality and sandbox play.