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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 a loud noise in a quiet place check out...
Hell Holes   - A fantasy golf dice game about escaping from Golf Hell through victory in a demonic golf tournament.
Anamnesis   - A solo tarot game about discovering yourself after memory loss
The World is Ending and We Are Very Large Dogs   - A Tabletop Game about Bringing Happiness at The End
Oniria's Slumber   - A game of dreamy ventures
Our Hero Neighbors 2E   - A new game of community, collaboration, and cooperation
C A S S 1 N 1   - A space exploration game for 2-4 players
Starlight   - A game about  finding your way home.
Fruit of Law   - An rpg about morality and the written word told with a single pomegranate
Unreality/Strictness -- The Single-Page Version   - A Six Elements Storytelling Game For 1-2 Players
Parley   - After years of war, will the things you learn encourage you towards peace or more violence?
A Visit To San Sibilia   - A solo journaling game about visiting an ever changing city
Mercury Mirror   - A game about learning the language of things