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These games are similar to Mythic Space ...
Offworlders   - A lightweight planet-hopping table top role playing game
BE SEEING YOU   - Independence, Control, Freedom & Compliance
Monolith   - Interstellar Science-Fiction Adventure Game
Necronautilus   - Science-Fantasy Roleplaying In A Universe Ruled By Death
Fake Chess   - Play like a master.
MOTH-LIGHT (beta)   - Post-Fall Science Fiction, Forged in the Dark.
A Modern Prometheus   - A Roleplaying Game for 2 Players about Gothic Horror, Dark Science, and Creating Monsters
Artefact   - A game of legendary items & transient heroes.
The Electrum Archive - Issue 01   - A Science Fantasy RPG Zine
QUILL.exe: Transmissions from the Black   - A Science Fiction Setting Supplement for A Letter-Writing Game for A Single Player
Return to the Stars Core Game   - optimistic science fiction tabletop role playing game
Any Planet Is Earth   - A six-page, rules-light 2d6 science fiction RPG and sandbox toolkit.
Mythic Space is similar to...
Through The Stars   - A narrative-first science fiction tabletop roleplaying game.
Dark Star VI   - A Science Fiction Horror Game
Monolith   - Interstellar Science-Fiction Adventure Game
deep breath   - a microgame for when it feels like you're drowning
Storm of the Century   - System-agnostic science fiction adventure kit pamphlet
Return to the Stars Core Game   - optimistic science fiction tabletop role playing game
The Titan in the Helix   - science fiction system-agnostic one-shot adventure
Fragged Empire 2 - Rules + Setting Guide   - A post-post-apocalyptic science fiction tabletop RPG.
Plasma Burn   - A rules-light science fiction roleplaying game of desperate people
Lightbringers - An TTRPG made in 24 hours.   - A Science-Fiction/Fantasy Boss Rush Roleplaying Game
Derelict Transdimensional Anomaly   - a one page science fiction system neutral pointcrawl
Four Ways to Die in the Future   - Four short science fiction games about death
If you like Primeval 2D6 check out...
Spoor   - A role-playing game to make your own - with interpretable rules and rogue magic.
OZR   - A lightweight framework for OSRish play
Revenant's Hack   - A free kriegsspiel roleplaying game.
Lost Archive   - Free Kriegsspiel roleplaying in a galaxy far, far away...
QUARREL + FABLE   - nostalgic british roleplaying
NEKROPOL   - THE FLESH IS WEAK. PERFECTION LIES WITHIN.
In Play Issue #1: Cyberpunk   - An RPG zine by FKR Collective
World of Ultraviolet Grasslands   - A World of Dungeons hack for UVG
ULTIMATE   - The solution to roleplaying
In Play Issue #2: Necromancy   - An RPG zine by FKR Collective
The Secret Glory   - mythos meets mörk
Messerspiel   - ultralite rpg inspired by bitd
If you like The Tattoopunk Antebible check out...
Branching Streams   - A supplement of additional game seeds and hacks for An Altogether Different River
Resistance Grows   - an expansion and setting overlay
Little Old Lady Investigator (A Troika! Background)   - A background for #TroikaJam
Sworn In Blood   - a supplement for Vampires & Claymores
Heroic Fates: Complete (5e)   - Mechanic for collaborative character progression in 5e.
Dungeoneers Pocketbook - A DURF supplement   - A Set of Dungeon based add-on's for DURF.
Spank Borg   - Make your Mork Borg experience even more ominous and dreary!
Patreon Papers 001: The Fighter & The Sage   - Two classes for the TRPG Ryuutama
Patreon Papers 002: Demons and Their Knives   - Three moves for the TRPG Dungeon World
The Assassin Snail   - a persistence hunter monster for MÖRK BORG
Our Innermost Thoughts   - a mostly-solo zine of small RPGs
Beneath Those Feathered Bear Gods   - A system agnostic pamphlet adventure setting full of strange bears