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These games are similar to One Thing Led to Another... A Villain's Origin, Multi-Point Plan, and Unexpected Banes and Boons They Encounter ...
Spellbook   - A solo journaling game about a Spellbook and its Witches, based on the Lost & Found SRD
B.B.E.G.   - A Tabletop Roleplaying Game where you're the villain
No Rest For The Wicked   - What does a villain do on their day off?
Villainous Volume I, The Widow of Roses - Campaign BBEG   - A Calculating Villain, Monsters, Treasure, and Hooks for your favorite Fantasy TTRPG
Monster Manifest   - 300+ Creatures from the SRD5 adapted for Quest RPG
Stewpot: Tales from a Fantasy Tavern   - A collection of games for running a tavern with your old adventuring party.
Fears and Fathoms   - A simple narrative horror game system for bringing your own horrors to life
Mines of Desperation   - Embark on a dice-driven adventure in a dynamic dungeon. Conquer the ancient-sealed lair of a relentless demon.
DNGN FKRS   - a Dice Game
Skirmish - D20 Arcade   - A Fighting Dice Game
Adventure Dice   - Make your own dice - and make your own story!
PUNKS (français + english)   - one page TTRPG with no dice, no masters !
One Thing Led to Another... A Villain's Origin, Multi-Point Plan, and Unexpected Banes and Boons They Encounter is similar to...
Adventure Dice   - Make your own dice - and make your own story!
Adamant, Fantasy Roleplaying Game (Beta)   - Dynamic Fantasy World RPG
Planström   - Dungeon Floor Plan System
My Girlfriend Is (Secretly) Evil   - A 2-3 player game where you fight your villain girlfriend and secretly make out
No Rest For The Wicked   - What does a villain do on their day off?
Dr. Aaron's Magic Game 18-in-1 RPG Planner & Shower Game   - A game to play in the shower to plan other games
Promo Generator/Bot Templates   - Generate dynamic promos for your self or others
Fragments   - Dynamic map rules for Beak, Feather, & Bones
Mon Tome   - Create and mutate critters using dice and tables
Villainous Volume I, The Widow of Roses - Campaign BBEG   - A Calculating Villain, Monsters, Treasure, and Hooks for your favorite Fantasy TTRPG
Session & Campaign Planning Tools   - Printable assets to help you plan and organise your TTRPG campaign - PWYC!
46   - Plan your dream hike (and stay hydrated!)
If you like TTRPG Design Lenses check out...
Village Witch   - A solo journaling game about a witch finding a home.
Splat 2: Adventures in Cyberspace   - Essays about TTRPGs, the internet, and remote play
Session Zero: World Building Edition   - A deck based world building game
RPG Design Zine   - A How-To Zine about Tabletop RPG Design
XD6 SRD - Hackable RPG Dice System   - A retro, Day-Glo, Nitro, freak-show, rainbow system - grab fistfuls of dice and gamble for epic FX!
Session Zero   - A deck based character creation game.
Editing for TTRPGs: A Primer for Non-Editors   - Some tips and tricks for editing when you can't hire one, and what to expect when you can!
EMERGE8 SRD   - For TTRPGs you design as you play.
Mega Dungeon Generator   - This is a system and setting agnostic toolkit for building your very own Mega Dungeon for RPGs
roll a setting in one second   - a superquick fantasy & sci-fi setting generator
Spiral Dice Hackers' Guide   - A guide to using Spiral Dice in your games
Uncontained - SCP Card Game   - Sacrifice civilians. Contain anomalies. All for the greater good!
If you like Into the Cave (ES/EN) check out...
C A S S 1 N 1   - A space exploration game for 2-4 players
Queenless - A solo RPG of exploration   - A solo RPG of exploration and hope.
Courier   - A solo exploration RPG about delivering cargo across a post-apocalyptic wasteland.
GLIDE   - A solo Sci-Fi RPG adventure of exploration on a desert planet.
Nomadic - Explore, Document, Survive   - A Solo Tabletop Role-Playing Game of Exploration and Survival
FLEE   - Fantasy Location Exploration
Journey In Search Of The Unknown   - Exploration and mysteries. A solo journaling adventure ✨
Honey Hex   - A Game Of Exploration For 1+ Players
so1um   - Solo RPG system
Dice Souls   - Souls-like Dungeon Exploration
QuestCrawl   - A One-page GMless Exploration RPG for 1 - 8 Players.
The (Un)Naturalist: A Solo Journaling Expedition   - Solo Journaling RPG in a setting of scientific exploration and unnatural observations
If you like The Last Nebula check out...
Welcome to ERF   - A Mothership module
Abilities Considered Unnatural   - A temple mine crawl for Mothership RPG
Mothership: A Pound of Flesh   - ...Sooner or later...Everyone pays... A space station toolkit for the Mothership RPG.
The Drain   - An Occult Mothership Funnel
The Third Sector   - A Mothership Sandbox Campaign
VOIDTOUCHED: A player class for Mothership 1e   - A class of weird, esoteric space priests for the Mothership Sci-Fi Horror RPG
Green Tomb   - Pamphlet module for Mothership
Exclusion Zone Botanist - A Solo Drawing Game   - A solo botanical sketching hex crawl game.
Thousand Empty Light   - A solo Mothership adventure set in an underwater tunnel
Rimbound Transmission 5: Exclusion Zone   - A Doomed Paranuclear Hexcrawl
Moonbase Blues   - A harrowing sci-fi horror TTRPG scenario
What We Give To Alien Gods   - An adventure module that explores thought, existence, and alien gods for the Mothership Sci-Fi Horror RPG.