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These games are similar to Mausritter Species Cheatsheet ...
Outward Bound   - A game of space exploration, inter-species cooperation and weird anomalies, based on the Four Points RPG System.
PINKHACK SRD   - System reference document for PINKHACK.
Four Points RPG System SRD   - System Reference Document for the Four Points RPG System
Six Sci-Fi Backgrounds For Troika!   - They're on cards, y'all!
Egress   - v1.0 System Reference
Haunted warrens   - Spooky rabbit home for Mausritter
The Wind in the Willows Adventures   - a Mausritter adventure setting
London Summer   - A solitaire Victorian party-crawler
The haunted sandy scrub   - 1 hex, a few subhexes and a flying saucer
Mycelium   - Mycelium is a quick one-page collaborative game where you must all work together to achieve a common goal
The Journeyman's Companion   - Being a compendium of common practices, superstitions, and magick talents.
Flatline Heist   - A minimalist RPG about heists in the astral plane
Mausritter Species Cheatsheet is similar to...
RPG Damage Location Charts   - For all Common Dice and deck of cards
OSE DM Quick Reference   - Common OSE and B/X and useful rules at hand
Egress   - v1.0 System Reference
Encounter Cards for Ironsworn   - Reference cards showing rank, features, drives, and tactics.
Fording the Derbal Yerrigan   - Catch invasive species and meet colourful characters
Mycelium   - Mycelium is a quick one-page collaborative game where you must all work together to achieve a common goal
The Journeyman's Companion   - Being a compendium of common practices, superstitions, and magick talents.
Flatline Heist   - A minimalist RPG about heists in the astral plane
Cyber-Monkey Archipelago   - A Push-powered cyber-pirate fantasy game
The Devil Would Be Proud (1E)   - A mephistophelic solo journaling rpg
2412: Ded Moroz   - A xmas-themed 24XX about stopping an eldrich-controlled russian santa
La Reina Hueca   - Un juego narrativo de horror noir urbano para 1-3 jugadores
If you like Laser Barbarians check out...
Æthernet   - A Rules Light, Occultech Horror Science-Fantasy RPG
The Electrum Archive - Free Rules   - Free rules-light science-fantasy RPG
The Way RPG   - Quest-based classic fantasy RPG
The Lurking Fear   - A Classic Investigative Horror TTRPG
VAULTS OF VAARN #1   - Science-fantasy tabletop RPG adventures on a psychedelic dying earth.
Cloud Empress: In the Land of Ten Thousand Cicadas   - An ecological science fantasy setting for the Mothership RPG
Swordquest - Micro Edition   - A One Page Fantasy Adventure Game
The Legend of the Forgotten Ballad   - An ultra-minimalist Sword & Songs RPG
The Eternal Caverns Of Urk   - A Procedural Science Fantasy Underground
Stewpot: Tales from a Fantasy Tavern   - A collection of games for running a tavern with your old adventuring party.
Alone Among the Stars   - A solo roleplaying game about exploring fantastic planets.
Sundown   - Transhumanist, cyberpunk, science fantasy ttrpg.
If you like The Thirteen check out...
Micro Mythos   - Play Cthulhu scenarios with simple rules
Career Opportunities (No Future #2)   - A scenario for Cthulhu Dark set in London's punk scene in 1977
Books & Bullets   - A tabletop micro-RPG of weird horror, action and investigation.  Based on John Harper's Lasers & Feelings.
qvke borg   - An expansion sourcebook for MÖRK BORG
Poisoned Soup   - Call of Cthulhu 7th Edition Scenario
The Books Were Wrong   - A Solo Sourcebook-Altering Journaling Game
Lay On Hands   - A solo, dexterity TTRPG about being a weird healer in a post-apocalyptic wasteland
Lay On Hands SRD   - A System Reference Document for Lay On Hands
Alien Dark   - These rules provide a way to explore the Alien Universe  with lite rules inspired by Cthulhu Dark.
Thousand Empty Light   - A solo Mothership adventure set in an underwater tunnel
OSSUARY   - OSR bastardised as a minimal, play-by-post-friendly system
Tiny Library   - A deck of 50 single-card RPGs from dozens of different creators