VALOR Engine — VASSAL-Adjudicated Legality Of Rules. Full rules, in your browser.

Choose a game. Every game runs at its full earned tier — the complete validated rules engine (the same Python engine, running in your browser) with tier selection, seeded dice and a replayable log. The first time you open a game it asks once for your own copy of its VASSAL module: the file is verified and read locally, never uploaded, and remembered on this device — that's also where the box art below comes from.