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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 Micro check out...
LOST EONS Core Books   - Solarpunk sci-fantasy mashup of BitD and 24XX in a post-post apocalypse world.
24XS   - A 24XX game but pocket sized
OZR   - A lightweight framework for OSRish play
Indexx   - 24XX roleplaying on an index card
ELDRITCH   - Lo-fi Cosmic Horrors using the 24XX engine
24XX Solo   - GM-less rules for 24xx and 2400 games
24VX - Vampire Hunter X   - 24XX hack about vampire hunting in a wasteland world of dark monsters
24XX: PREDATORS   - A 24XX game about infiltrating a city that's been overrun with dinosaurs.
2400 BC: Ancient Apocalypse   - Rebuilding community in the distant past.
[BXLLET>   - Bullets make power. Power makes ruin. Ruin makes fertile ground.
Spoor   - A role-playing game to make your own - with interpretable rules and rogue magic.
ULTIMATE   - The solution to roleplaying
If you like The Labyrinth of Myclasia check out...
Tavern at the End of the World   - A solo journaling game
The Empress and her Seer   - A solo journaling game
Pangolin Pianist   - A tiny solo journaling game
Walking Near Lanterns   - A wondrous and intimate pointcrawl festival
People, Places & Perils   - A story-building game about exploring a wondrous land.
Ligmàmon RPG   - A  TTRPG set in a world full of wondrous creatures
Girl Underground   - A curious girl in a wondrous world
Roommates: I'm Just Not Sure   - A Solo Journaling Game
Looking after an orbiting rock   - a solo journaling game
As the World Falls Down   - A 5-minute Labyrinth-inspired solo game.
a dying structure   - a tiny solo ttrpg
Carta SRD   - A Toolkit For Creating Single-player Exploration Games