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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 Crossing the Seven Stars check out...
Starlight   - A game about  finding your way home.
Shepherds   - A JRPG-inspired tabletop RPG about doing the right thing
Our Hero Neighbors 2E   - A new game of community, collaboration, and cooperation
Coffee Shop AU   - a two-player game about cozy café romance
a loud noise in a quiet place   - A tabletop story game for one or two players about temporary hearing loss
For the Queers   - A Descended from the Queen game that focuses on queer relationship dynamics
Roller Rink Redux   - a game about revisiting things that scared you as a closeted queer middle schooler
BAD MOON   - a game to play with the Moon that has wronged you
Advanced Lovers & Lesbians   - DRAW YOUR SWORD AND BARE YOUR HEART…
NO LOVE'S LAND   - robot girlfriends across the battefield
Words, Wilting   - A 2 Player Game of a Secret Love and Communication Wilting
KENZIE'S PROJECT   - a 3-player horror game about how academia changes us
If you like ECO MOFOS!! check out...
Runecairn: Core Rules   - Soulslike Norse fantasy tabletop role-playing game
An Altogether Different River   - A GM-less storygame about returning home and grappling with what has changed
Far From Home   - A game about immigrants and outsiders
CRASH//CART   - A Forged in the Dark TTRPG of near future paramedics
Ithaca in the Cards   - A blackjack-driven story game of doomed travelers
Homebound   - An anthology of games about home and going away
Adrenaline   - Near Future, Forged in the Dark
BRIGHTHAMMER   - Rules Light High Fantasy Roleplaying
Branching Streams   - A supplement of additional game seeds and hacks for An Altogether Different River
Runecairn Wardensaga   - Norse fantasy Soulslike tabletop role-playing game
dungeonpunk   - a punk fantasy zine rpg
Marvelous Mutations & Merry Musicians!   - a game about post-post-apocalyptic kinda-solarpunk musicians travelling the once-wastelands
If you like Automatown check out...
Kingscairn Issue 1   - A Victorian Science Fantasy Zine for Troika!
Slow Sleigh to Plankton Downs   - A journey to the glaciated world of Mora's Misstep
SPROUTS ~ RPG   - Hand-drawn creatures travel across real-life terrain in this lighthearted adventure ttrpg.
The Moon King Wants to Party   - Escort an insufferable noble through a decadent party.
PRIME APES   - oo oo. aa aa.
Six Friendly Backgrounds for Troika!   - All original illustrations and backgrounds for Troika! Plus, a bonus quest generator.
A Forest God - A Troika! Background   - Play a strange, fickle god from a deep and mysterious forest realm.
Odd Jobs   - A micro-setting anthology
The Archon Ruins   - A micro-setting zine for tabletop adventure games
The Grinning Tome Inconsistent   - A Troika! supplement of several not quite reliable spells.
Raid on the Decadent Spires   - An opulent, Tower-Crawling adventure for the world’s most popular role-playing game
Bakto's Terrifying Cuisine ULTRA - PREVIEW   - The world's greatest culinary adventure.