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These games are similar to The Big Blaseball Activity Book ...
Fate Condensed   - Fate Core in 50 pages or less. Refined. Streamlined. Stand-alone. Open licensed.
Icy City Omnibus   - Over 300 pages of 5E-focused adventures & supplements
Patchwork Potions   - A solo journaling and grid-coloring RPG about witchy business
DIE A HUNDRED TIMES   - a d100 system in 2 pages by Kobayashi
Métapole   - Un supplément pour le jeu de rôle The Sprawl. Une véritable bible cyberpunk de 400 pages!
TRAPPED WITHIN   - A Mörk Borg Zine containing 60 pages of horrifying awesomeness
The Journal of the Mad Cuthos Taji - Field of Visions   - Fragmented Journal - Art zine/booklet of missing pages to the field of visions
don't cut the tree/be the tree   - [solo ttrpg – 2 pages – 30 min.] two seeds, two letters, two sides of a solo ttrpg game
Angel.Net   - An interactive coloring book.
Shudderspeed Complete   - All first party Shudderspeed pages in one place, plus extras.
Tiny Solo   - Pocket rules and tables (4 pages) for playing solo roleplaying games in any genre or setting!
5th Quinquennial Interstellar Interdisciplinary Conference   - 12 writers, 16 pages. QuIIC is a collection of scientific abstracts featuring the Master Skills from MothershipRPG.
The Big Blaseball Activity Book is similar to...
Patchwork Potions   - A solo journaling and grid-coloring RPG about witchy business
DIE A HUNDRED TIMES   - a d100 system in 2 pages by Kobayashi
Project ECCO   - A solo time travel game played across the pages of a planner
Icy City Omnibus   - Over 300 pages of 5E-focused adventures & supplements
Simpler D+D   - All the icing from the D+D cake, squeezed into 3 pages
QuestMark   - QuestMark: Turn Pages, Forge Destiny.
Shudderspeed Complete   - All first party Shudderspeed pages in one place, plus extras.
Simpler Cthulhu   - All the icing from the Cthulhu cake, squeezed into 3 pages
Hot Circle   - A hack of Burning Wheel simplified down to 28 pages.
don't cut the tree/be the tree   - [solo ttrpg – 2 pages – 30 min.] two seeds, two letters, two sides of a solo ttrpg game
The Journal of the Mad Cuthos Taji - Field of Visions   - Fragmented Journal - Art zine/booklet of missing pages to the field of visions
Ghostbusters 1986, les règles complètes du fameux JDR !   - En français, les règles complètes du JDR en 4 pages !
If you like The Smiling Mountain Annals check out...
Glory Hole Mimic - A MÖRK BORG Monster   - New monster compatible with MÖRK BORG
The loneliness of the Múrmaiden - A MÖRK BORG Adventure   - An adventure compatible with MÖRK BORG
BEstitchARY   - A bestiary supplement compatible with MÖRK BORG
The Horde from Beyond - A MÖRK BORG Adventure   - An adventure compatible with MÖRK BORG
Tatterhood   - An adventure compatible with MÖRK BORG
Fugitive Knight - A MÖRK BORG Class   - New optional character class compatible with MÖRK BORG
Sleep Now in the Fire   - Monsters and items for Mörk Borg
Clamdash!   - A Kergüsian scenario compatible with MÖRK BORG
Mürky bog   - A pamplet dungeon compatible with MÖRK BORG
The Lonely Throne   - A Mysterious Location compatible with the MÖRK BORG roleplaying game
Monolith 1: Harvest   - A Mörk Borg zine
Flesh Alchemist   - a class compatible with Mörk Borg
If you like The Van Witch check out...
Working For The Corp   - Descended from the Queen game set in a cyberpunk dystopian future
Novel Story   - A Solo RPG About the Life of a Novel
Village Witch   - A solo journaling game about a witch finding a home.
Beloved   - A solo journaling game about playing a beloved childhood toy.
The Magical Year of a Teenage Witch   - A slice-of-life witch journaling game using the Thousand Year Old Vampire System.
Spellbook   - A solo journaling game about a Spellbook and its Witches, based on the Lost & Found SRD
Monster Realm: Student Exchange Program   - In a school of monsters, will you make lasting friendships or bitter enemies?
The Devil Would Be Proud (1E)   - A mephistophelic solo journaling rpg
Princess with a Cursed Sword   - A solo journaling game
Life on the homestead   - A solo journaling rpg
Sunfish Sitting There   - A slice-of-life simulation about the frustrations of life ?
Build a Witch   - A character creation pack for role playing or storytelling.
If you like d20 Monopoly! check out...
Aberdeen Issue 1   - The premiere modern-fantasy setting for your favorite ttrpg.
The Way RPG   - Quest-based classic fantasy RPG
bastard! solo-play procedures for bastards.   - solo roleplaying rules for your favorite fantasy TTRPG.
Aberdeen Issue 2   - The premiere modern-fantasy setting for your favorite ttrpg.
Chateau Narwal   - A one-page adventure location for your favorite ttrpg.
Dungeon Goons   - A Classic Fantasy Hack for Tunnel Goons.
The Fane of the Hungry God   - A dungeon for classic fantasy TTRPGs
Brigands Rest   - A one page dungeon for your favorite fantasy rpg.
The Lurking Fear   - A Classic Investigative Horror TTRPG
The Bastardized Classics   - a collection of adventures for you favorite fantasy rpg.
Carta SRD   - A Toolkit For Creating Single-player Exploration Games
In Pursuit of what is Hidden   - a Bastardized Classic module for your favorite fantasy RPG.