A downloadable campaign

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Explore 10 Downing Street in a brand new way...

10 Downing is a 50-page campaign for Mausritter, the epic sword-and-whiskers RPG. The campaign includes a complete setting with 11 integrated questlines and 5 ready-to-play quests that create a cohesive story throughout the location.

Purchase the A5 hardcover directly from DriveThruRPG *

For as long as the British Prime Minister has lived at 10 Downing Street, so have the mice. For many years they co-existed in peace, with only the kitchen staff knowing of their existence, leaving them tasty morsels to secret away into their homes in the walls. It was a wonderful, peaceful time.

Then the rats arrived.

A gang of cockney rats started muscling their way into the house and causing trouble for mice and humans alike. The rest of the staff discovered this rodent problem and sought to end it once and for all. Thus, a new member was added to the Prime Minister’s staff - a cat, with the grand title of Chief Mouser.

For many years, Larry, the Chief Mouser, has been happily employed and lives a pampered life with the humans. While he certainly does do his best to rid the house of rats, he holds a secret alliance with the mice - if they agree not to cause trouble, he will leave them alone. He employs a retinue of mice who serve him faithfully, mostly out of fear that the unbalanced alliance could end in disaster for them at any moment.

"10 Downing: A Mausritter Campaign includes everything a Mouse Master and her micey medley need to play through a mini-campaign of multiple mouse sessions."

- pookie @ Reviews from R'lyeh

Some things you'll find inside this campaign set in the real-world house of the British Prime Minister include a trap dungeon, a floor tile puzzle, a Home Alone-style quest where you get to set the traps, political intrigue and treachery, a stealth-based quest, sneaky opponents, and mysterious artefacts.

If you purchase the digital edition and later decide to order the hardcover book, I'll send you a discount code so you only pay the difference. Fill in this form to let me know!

The downloads include:

  • An extensive location map using the actual plans for all three floors of the house
  • Maps for all quests and locations within the house
  • 11 integrated questlines
  • 5 ready-to-play quests/adventures
  • 6 competing factions
  • 8 new hirelings
  • New creatures (also available in a free bestiary)
  • Diverse characters (including Larry the cat - the British Prime Minister's Chief Mouser)
  • Valuable treasure
  • Unique spells
  • Foreword by Isaac Williams, creator of Mausritter
  • Book in A4 and US sizes

It is everything you need to run a full Mausritter campaign that will delight your players and provide many months of adventure for any game table.

Like with Kiwi Acres, we really enjoyed getting to check out this adventure for Mausritter! It posed new challenges, gave us more areas to explore, and was engaging for both me as the game guider and my kid as the player. We liked the variety in the different quests available and had a lot of fun with it – I hope you do too!

- Steph C @ TTRPGkids

Get a preview of 10 Downing with a free adventure and bestiary:

How can you use this?

Introduce your players to the setting and allow them to walk around the house and find out about the residents and quests at their own pace. The quests are complete adventures that take place within the house and they can be taken on in any order the players like, with the outcomes having a real impact on the political landscape and how subsequent quests will play out.

Use the keyed map and random encounters to bring the action to your players and allow them to add their own narratives to the storied halls of 10 Downing Street.

The 50-page book is available to download in A5 and US sizes as spreads, singles and a booklet layout. The downloads include maps for all locations, as well as PDFs for items, spells and conditions.

Purchase the A5 hardcover directly from DriveThruRPG *

If you enjoy 10 Downing, check out Kiwi Acres, a Mausritter campaign setting and adventure collection set on a New Zealand farm:

Compatible with Mausritter Kēmu Whakatau O Aotearoa / KiwiRPG

Join the Tiny Tails Patreon for more Mausritter content: Join Tiny Tails on Patreon

10 Downing is an independent production by Hugh Lashbrooke and is not affiliated with Losing Games. It is published under the Mausritter Third Party Licence. Mausritter is copyright Losing Games.

Logo and cover image by Catherine Lashbrooke. Closet image by Rachel Lashbrooke. All other images are used under the CC0 licence.

This work is licensed under a Creative Commons Attribution 4.0 International License. You are free to share this work in any medium or format as well as remix or transform it in any way you like for any purpose, provided you attribute your work to Hugh Lashbrooke and indicate if you made any changes. Copyright © Hugh Lashbrooke 2023.

Purchase the A5 hardcover directly from DriveThruRPG *

Updated 9 days ago
CategoryPhysical game
Rated 5.0 out of 5 stars
(3 total ratings)
AuthorHugh Lashbrooke
Tags10-downing, british, campaign, kiwirpg, mausritter, nsr, OSR, quests, Tabletop role-playing game
Asset licenseCreative Commons Attribution v4.0 International
Average sessionDays or more
AccessibilityColor-blind friendly, High-contrast


Get this campaign and 1 more for $22.00 USD
View bundle
Buy Now$11.00 USD or more

In order to download this campaign you must purchase it at or above the minimum price of $11 USD. You will get access to the following files:

10 Downing - A5 Spreads.pdf 18 MB
10 Downing - A5 Singles.pdf 19 MB
10 Downing - A5 Booklet.pdf 42 MB
10 Downing - US Spreads.pdf 17 MB
10 Downing - US Singles.pdf 18 MB
10 Downing - US Booklet.pdf 41 MB
10 Downing - Maps.pdf 13 MB
10 Downing - Items.pdf 8.1 MB

Development log


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Fun setting!  I liked getting to try it out with the fam, and it is very cute while also being great for grown up players to stay engaged too!  I have a full review linked below on TTRPGkids, and I'm glad we got to check it out: 



Thanks for the great review!

(1 edit) (+1)

10 Downing is now available in print! Order your A5 hardcover copy here: https://www.drivethrurpg.com/product/456757/10-Downing-A-Mausritter-Campaign?aff...