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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 A Granny & Three Babies check out...
Global Dragon Egg Conservation   - A solo journaling game about taking care of dragon eggs
Spring Comes Again   - "Spring Comes Again" is a 10 page solo journaling RPG
Placehood: A Game of Mutual Exploration   - Every person is their own little world.
game poems   - A zine of little games
d66 Starting Loadouts for Cairn   - Quick character equipment packages modeled on classic adventure tropes.
ORC BORG   - Brutal chaos powered by MÖRK BORG
The Treasure At The End Of This Dungeon Is An Escape From This Dungeon And We Will Never Escape From This Dungeon   - A kaleidoscopic roguelike dungeon crawl
Walking in Twilight: A Guide to After the End   - A game about what comes after the end of everything.
The Speakeasy: Depression Era Gear Packages   - D66 Gear Packages for Cairn
They Mostly Come At Night   - A solo survival horror game based on The Bear Comes At Night.
Little Wizards Game   - A game for little *wizards* <):-}
MORTAL POP!BAT   - Battle It Out To See Who Comes Out On Pop(tm)!
If you like Tropical Heat check out...
Paris Gondo - The Life-Saving Magic of Inventorying   - A Play-Based Method in SIX STEPS to BANISH ENCUMBRANCE FOREVER!
The Land Beyond   - A solo RPG about letting go
Blood Mountain Resort & Spa   - A totally normal tropical resort for DURF
The Lost Isle   - A mysterious island pointcrawl
BLOOM   - A solo journaling rpg about girls trapped on an infected island. Made for #WretchedJam.
Yokai Hunters Society   - A rules-light pen & paper RPG about monster hunters in Meiji Japan.
And The Gunslinger Followed   - A solo TTRPG about one person following a criminal through the desert.
Révolution - RPG   - Tarot based RPG of political revolution in an alternate 1790s Paris
Our Ladies of Safe Harbor: A Brindlewood Bay Mystery   - A cozy little mystery on a rain-soaked island
Bloodstone   - Action-Horror pamphlet rpg for one-shot sessions
Souvenirs   - A journaling game about creating objects infused with personal memories
Crow Island: funeral // PROCESSION   - A solo TTRPG exploring a portion of East Central Crow Island during the early years after its creation.
If you like The Occupied Fortress check out...
The Ambulatory Temple   - A One-Page Dungeon
The Small Old Kingdom of Somnaire   - System-free pocket zine setting about a strange, mostly dead country
Unseen Hall   - A One Page Dungeon
Sangam: Academy of Poets   - a system neutral one shot
Swords Under The Sun   - Blades in the Dark meet Dungeon World
BOWLER   - A System-Neutral Autumnal Horror Adventure
Into the Icebound Caves   - A one-page dungeon for fantasy TTRPG's
Beach Episode   - leave your grief at the beach
Melting Pot   - One Page Dungeon
Parley   - After years of war, will the things you learn encourage you towards peace or more violence?
Bodies In Flight   - A system neutral adventure
The Jewel of the Sea   - A Seafaring One Page RPG