Ultima Ratio Regum

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Ultima Ratio Regum
Beta Project
Developer Mark Johnson
Theme Strategy Games
Influences Dwarf Fortress, La-Mulana, The Outer Wilds, Nethack, Europa Universalis, Borges, Eco
Released ~Summer 2012 (alpha)
Updated January 2023 (0.10)
Licensing Closed Source
P. Language Python
Platforms Windows
Interface ASCII, Keyboard
Game Length Hour or two (currently)
Official site of Ultima Ratio Regum


Ultima Ratio Regum ("the last argument of kings") is a game designed to combine the massive and varied world of games like Dwarf Fortress or Europa Universalis with the cryptic puzzle-solving and clue following of games like The Outer Wilds and La-Mulana. Set approximately around the Scientific Revolution, the player is tasked with discovering a conspiracy via identifying procedurally-generated clues hidden throughout the world's cultures, religions and societies; the game features extensive procedural generation of everything from tombs and religious altars to (in the future) paintings and sculptures, any or all of which may contain the clues required in a given playthrough. The latest major releases, 0.9 and 0.10, introduce currencies, procedurally-generated items, trade, and ship-board travel. 1.0 is coming soon - watch this space!

Where to find Ultima Ratio Regum

The latest build can be downloaded at: "MarkRJohnsonGames".


“Ultima Ratio Regum is one of a few ambitious, long-term projects which I think represent the most exciting things about indie game development, about PC games, and about what technology can do for the games of tomorrow.” - Graham Smith, Rock Paper Shotgun