Mausritter - Starter guide

What is Mausritter?

Mausritter is a rules-light fantasy roleplaying game in which you play a mouse adventurer in a world that is enormous, dangerous, and full of wonder. Everyday objects become landmarks, a common housecat is an apex predator, and a cracked acorn cup might be someone's prized possession. The tone draws from the tradition of Brambly Hedge, Beatrix Potter, and similar small-world folklore: cozy on the surface, but with real teeth underneath.

It was designed by Isaac Williams and published through his studio Losing Games. Despite the storybook aesthetics, Mausritter is rooted firmly in the OSR tradition. Mouse life is fragile, danger is telegraphed but genuine, and clever play matters more than character sheet optimization. Adventures tend to be short, punchy, and driven by exploration and resource management rather than narrative arcs with predetermined endings.

How does the system work?

Mausritter is built on the chassis of Into the Odd, though it has evolved considerably from that foundation. The core of the system is simple: each mouse has three attributes - Strength (STR), Dexterity (DEX), and Will (WIL) - each with a score between 3 and 18. When a risky action requires resolution, you roll a d20 and try to roll equal to or under the relevant attribute. No modifiers, no fiddly math. Either you make it or you don't.

Combat works differently from most RPGs: you do not roll to hit. Attacks always land, and you go straight to rolling damage. Each side rolls their damage dice simultaneously and applies the results. Mouse characters are measured in Grit (a small hit point pool representing luck and stamina) alongside their STR score. When Grit runs out, further damage chips away directly at STR. Drop STR to zero and your mouse is dead. Fights are fast and lethal enough that avoidance and smart play are often better options than standing your ground.

The inventory system is one of Mausritter's most distinctive features. Each mouse has a limited number of inventory slots, and items are represented by physical cards that slot into your character sheet. Conditions like Exhausted or Frightened also occupy inventory slots, meaning your carrying capacity and your physical and mental state are managed through the same resource. Items wear out through a usage system tracked by marking notches on the card. Trading gear between players is literal: you hand the card across the table.

Magic is treated as a scarce, dangerous resource. Spells exist as physical items to be found in the world rather than abilities you learn. There are 15 spells in the core rules, each of which can backfire if overused.

Character creation is quick and heavily randomized. You roll 3d6 for each attribute (keeping the two highest dice), roll for your background (which gives you starting equipment and context), and pick a birthsign that defines your mouse's personality. The whole process takes minutes.

What do you need to get started?

The core rulebook is all you need to play. It is a 48-page book that covers the full rules, a GM toolbox with hexcrawl procedures, a bestiary, a starting adventure, and a hexmap. The PDF is available on itch.io on a pay-what-you-want basis, which makes it genuinely free to try. A physical print edition exists and is well-regarded for its clean design and quality.

Downloadable character sheets, item cards, and condition cards are freely available at mausritter.com. These physical cards are central to the inventory system and are worth printing out before your first session.

The Estate Adventure Collection is the main official supplement: a campaign framework built around a sprawling country estate, with multiple interconnected adventure sites and factions. It is not required to start playing, but it provides a lot of structure for groups who want a ready-to-run sandbox campaign. Beyond that, the Mausritter community at library.mausritter.com hosts hundreds of free third-party adventures, supplements, and tools.

Who is this game for?

Mausritter works remarkably well as an entry point into tabletop RPGs. Character creation is fast, the rules fit on a few pages, and there is enough built-in randomization that new players are not overwhelmed by choices before they even start. The whimsical setting tends to lower the perceived stakes in a way that helps nervous newcomers relax into play.

For experienced players, particularly those with an interest in OSR design, Mausritter offers tight, considered mechanics and a setting with genuine personality. The inventory system in particular rewards players who enjoy interacting with gear and resources rather than treating them as background bookkeeping.

It also works well for families and younger players, provided the GM is comfortable managing the lethality. Mice die in Mausritter. Not gratuitously, but meaningfully. Character creation is fast enough that death does not derail a session, but it is worth calibrating expectations.

Where Mausritter falls short is in long-form character progression. Experience and leveling exist, but they are not the engine of the game. If your group is primarily motivated by building and advancing a character over many sessions, other systems will serve you better.

How does it compare to other systems?

The most useful comparison is probably with Dungeons and Dragons 5th edition. Where D&D 5e gives you a robust character build system, rising power levels, and a ruleset that rewards mastery and planning, Mausritter gives you speed, scarcity, and an emphasis on the session itself rather than the campaign arc. A first-level D&D character is relatively durable. A first-session Mausritter mouse is not.

Mouse Guard, the other well-known rodent RPG, is a closer thematic cousin but a different design philosophy. Mouse Guard uses the Burning Wheel engine and foregrounds the political and social tensions of its mouse civilization, with mechanics built around belief statements and relationships. Mausritter is much lighter and more focused on dungeon-crawling and exploration. Both are worth your time; they just scratch different itches.

Where do you start?

Download the PDF from itch.io or buy the print edition. Read through the player section (roughly the first 20 pages) before your first session. The GM section is also approachable and includes concrete advice on how to run the game, telegraph danger, and build encounters.

Before your first session, print out character sheets and item cards from mausritter.com. Use the included adventure in the rulebook as your first scenario - it is designed to work at the table immediately. Once you are comfortable with the basics, The Estate Adventure Collection provides a significant amount of ready-to-use campaign material.

For video resources, the Mausritter page on itch.io links to a number of actual plays and tutorials. The community Discord is active and welcoming for new GMs with questions. The mausritter.com website also has an instant character generator that is useful for demo sessions.

Recommended products

Start with the Mausritter boxed set or the Core Rulebook. From there you can add enough adventures for years to come.