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These games are similar to R’lyehwatch ...
Statuesque   - A Solo/Dual TTRPG in Two Acts
1-6 Oozes in the Dark   - A print-and-play micro-module for 5e
CTHULHU DEEP GREEN   - Conspiracy Horror inspired by the Cthulhu Mythos. 3-6 players.
Brinkwood - The Blood of Tyrants - Playtest Kit   - Robin Hood vs. Vampires. Mask up. Spill blood. Drink the Rich.
No God's Country: Resistance, Forged in the Dark   - Cell-Based Resistance vs. Theocratic Fascism. Light a fire.
HEARTH - HEDGE Expansion   - A (free) roleplay and campaign expansion for the post-apocalyptic heroes vs fey combat game HEDGE.
Tiny Library   - A deck of 50 single-card RPGs from dozens of different creators
So You've Been Thrown Down A Well (third party module for Troika!)   - A Troika! Double-zine adventure and backgrounds
Alien Dark   - These rules provide a way to explore the Alien Universe  with lite rules inspired by Cthulhu Dark.
Micro Mythos   - Play Cthulhu scenarios with simple rules
this person should not exist   - an artefact-making game of Where's Wally defacement and surveillance weird horror
Worlds Without Master Issue 3   - A PDF magazine of sword & sorcery tales, games, and comics. Includes Swords Without Master!
R’lyehwatch is similar to...
Dicey Wizards   - 2 players vs monsters card game
Killsplosion   - action movie player vs player RPG
CTHULHU DEEP GREEN   - Conspiracy Horror inspired by the Cthulhu Mythos. 3-6 players.
Yes, Vandpire   - Improv Performers vs Vampires - The TTRPG
Vampire Dark V5   - a hack of Cthulhu Dark with Vampire the Masquerade
Ceux qui luttaient dans les ténèbres   - Appel de Cthulhu avec un système PbtA.
Creating Good Investigators | Creare buoni Investigatori   - A fan-made expansion for Cthulhu Dark
In Our Likeness   - Undead celebrities vs soulless management.
Alone Against the Flames   - An Introductory Solitaire Adventure for Call of Cthulhu
Micro Mythos   - Play Cthulhu scenarios with simple rules
No God's Country: Resistance, Forged in the Dark   - Cell-Based Resistance vs. Theocratic Fascism. Light a fire.
Alien Dark   - These rules provide a way to explore the Alien Universe  with lite rules inspired by Cthulhu Dark.
If you like The God 'IM' check out...
An Altogether Different River   - A GM-less storygame about returning home and grappling with what has changed
The Creature Comes for Us   - A card-drawing game for 1+ players. Create a world, a menace to threaten it, heroes to fight it, and then do battle.
Goblin Market   - A 1-4 player GMless game about meeting the fae and choosing where you belong.
Downfall   - Create the world, and then destroy it.
To Stand Before the Dragon's Wrath   - Slay a dragon or die in the attempt.
LAZULI   - This is a game about a god
Aether: A Heroic Fantasy RPG   - A card-based Fantasy TTRPG all about choosing your fate and deciding what heroism means to you.
With My Last Undying Breath   - A solo journaling game of vampires, memories, and one last attempt to hold onto humanity
Saviors of Hogtown   - A Dungeon World adventure supplement for 3-6 players.
The Isle   - An adventure for The Vanilla Game or another fantastic or historical roleplaying game of your choosing.
riding past the end of the world   - a post-apocalyptic journal adventure.
Divine || Mundane   - a game about gods, mortals, and the space between
If you like The Afternoon Train Home check out...
Live. Love. Die. Remember.   - An RPG of memories and mecha love
Prize   - a journalling  game of containment and property
Train Tracks   - travel by train to visit an old friend
What REALLY Happened.   - You are the character that was written out of the story.
Solo Roleplaying: A brief introduction   - introduction to solo rpgs
Dave Ex Machina   - A light, ridiculous storytelling adventure for one or two
Pyriscence   - A solo rpg in which you play as a forest fire.
Castle of Memories   - A solo-TTRPG about exploring a castle and finding lost memories
Unknown Oceans - Complete Edition   - Chart new places while walking
Solstice Grounds   - Explore our beautiful, bizarre national park.
I Am   - We decide who we are, no one else.
Fake Chess   - Play like a master.
If you like Dwarven Lords' Feast check out...
Cook & Hero   - A pamphlet game about dangerously exploring adventurous flavors
BAKTO'S TERRIFYING CUISINE   - A Deliciously Dangerous Culinary Adventure For Starving Level Adventurers
Off Recipe   - a reflective cooking LARP for 1+ players
Mythic Mortals   - A tabletop roleplaying game where YOU are the hero.
COME DICE WITH ME   - A role-playing game inspired by a competitive dinner party show.
Gallowglass   - a free-form-ish ttrpg
WARDENS - 24XX Fantasy   - Adventures in a wild world filled with spirits and weird magic.
Dungeon Hero Volume 2: Giant Beasts   - More adventure 'zines for the "Dungeon Hero" mini-RPG.
TERMINUS   - The Final Journey Of A Legendary Hero
The Orc and the Pie   - A roleplaying game based on Monte Cook's "the world's shortest adventure"
1400 PLANES   - Lo-Fi Hi-Fantasy Plane-Hopping RPG. Part of the 1400 plug-and-play micro-RPG series.
Tendencies: Spirits and Glamour   - Tend To The World, Tend To Your Hearts