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These games are similar to Reign of the Star Kings ...
Highwinds   - Space opera tabletop RPG.
Transmission for Them   - a solo journaling game about lovers lost in space
C A S S 1 N 1   - A space exploration game for 2-4 players
Starward   - Sci-fi fantasy supplement for Swords Without Master and Rogue Scroll
Vast & Starlit   - The complete nano-game of interstellar crime & rebellion by Epidiah Ravachol.
Offworlders   - A lightweight planet-hopping table top role playing game
Nautilus of Time   - A one-page Sci-Fi timeship crawl
Save the Universe   - A sci-fi adventure RPG.
Wondrous Terrible   - Micro 4x space exploration ttrpg. Build a weird species, explore the void, get into trouble, throw dice at a bowl.
Starcana   - Cosmic Fantasy Roleplay
Living with the Certainty of Death by the Imminent Explosion of Our Orbiting Artificial Planet Public Guest Five   - Live well until the artificial world explodes
With Teeth Like Stars   - A Gothic and Glamorous Space Opera Role Playing Game
Reign of the Star Kings is similar to...
Highwinds   - Space opera tabletop RPG.
Plerion   - Space Opera Adventure Game
Capax Astra   - A vaporwave space opera TTRPG.
B!TH! Wave 1 Tribute Booklet!   - One Page, "mini book" style hand-drawn pamphlet.
Starward   - Sci-fi fantasy supplement for Swords Without Master and Rogue Scroll
Section 5   - Tactical Espionage Space Opera RPG
Star Dogs Diceless Edition   - A diceless space opera roleplaying game.
Blooded   - a solo RPG of empire, resistance, and ghosts
Living with the Certainty of Death by the Imminent Explosion of Our Orbiting Artificial Planet Public Guest Five   - Live well until the artificial world explodes
The Galactic Realm of The Hyperspace Sea   - Epic, rules light, space opera TRPG
Net Runner   - A hack of the Carta SRD for dystopian future internet warfare.
StarSwept   - a solo RPG of exile and exploration among the stars
If you like Starlight check out...
Hell Holes   - A fantasy golf dice game about escaping from Golf Hell through victory in a demonic golf tournament.
Come Home   - A three player GMless diceless storytelling TTRPG about finding home
Oniria's Slumber   - A game of dreamy ventures
The World is Ending and We Are Very Large Dogs   - A Tabletop Game about Bringing Happiness at The End
The Cloister   - A two player storytelling game about the last hour of a long journey home
Village Witch Post   - A postcard game for a witch writing letters about her new home.
Wise Women   - A ttrpg about witches using plant magic to protect their community, while having to navigate its prejudices and taboos.
Our Hero Neighbors 2E   - A new game of community, collaboration, and cooperation
a loud noise in a quiet place   - A tabletop story game for one or two players about temporary hearing loss
Lichcraft   - An RPG about trans necromancers
Crossing the Seven Stars   - A 2-player game about useless lesbians mutually pining for each other across lifetimes
Roller Rink Redux   - a game about revisiting things that scared you as a closeted queer middle schooler
EXTRACTION FROM DEMON-FUCKED CLEVELAND 1996   - THE PRESIDENT IS TRAPPED IN THE DEMON CITY
Echoes in the Graveyard   - A horrific time-loop adventure for Mothership.
Vast & Starlit   - The complete nano-game of interstellar crime & rebellion by Epidiah Ravachol.
Anomalous Carbon Sludge   - A system agnostic sci-fi horror adventure
Nautilus of Time   - A one-page Sci-Fi timeship crawl
Save the Universe   - A sci-fi adventure RPG.
Wondrous Terrible   - Micro 4x space exploration ttrpg. Build a weird species, explore the void, get into trouble, throw dice at a bowl.
The Beast of RS4   - A space horror pamphlet.
Hands On Research   - A single player narrative game focused on performing research in the SCP universe.
Sunk City   - A setting expansion for ANNA-X66
THERE IS A GOBLIN ON THE LOOSE IN ICARUS STATION - a goofy horror adventure for Mothership 1e   - A pamphlet module of goofy and fantastical creature horror for Mothership 1e
Spacer V2   - Knave in Space!