Petri Leinonen·Dec 18, 2025The Cyborg Game MasterWhy the “AI DM” is a Lie, but the Exosuit is the Future
Petri Leinonen·Dec 13, 2025The Gentrification of the DungeonHow the AA Tier Standardized the Underground
Petri Leinonen·Mar 22, 2022Distancing from the Frontier Myth (Them Deeper Bones design diary 12)The Frontier Myth is strong in the traditional Fantasy TTRPG paradigm, but my personal cultural touchstones are different…
Petri Leinonen·Dec 26, 2021On the First Year (Them Deeper Bones design diary 11)Them Deeper Bones is my retro adventure fantasy role-playing game that can be found over on https://themdeeperbones.com/ (as of writing…
Petri Leinonen·Oct 27, 2021On Ability Scores (Them Deeper Bones design diary 10)Them Deeper Bones RPG does some significant changes to how Ability Scores work from a lot of other OSR games that draw on the legacy of D&D
Petri Leinonen·Sep 17, 2021On Perks (Them Deeper Bones design diary 9)In Them Deeper Bones, the Perks are not really superpowers, but actually a tool to gauge where you want to put an extra safety net in…
Petri Leinonen·Sep 9, 2021On the retro adventure game mentality (Them Deeper Bones, design diary 8)Writing about the difference between the OSR and the Retro Adventure TTRPG that Them Deeper Bones is.
Petri Leinonen·Aug 10, 2021On Worldbuilding (Them Deeper Bones, design diary 7)Building a world to a retro adventure game of post-post-apocalyptic fantasy, and some thoughts on the ways I cheated while doing it
