DOOM in Hearts of Iron IV

What it does

A Hearts of Iron IV Workshop mod that runs the whole DOOM engine, based on doomgeneric, inside the game's own scripting system via a C -> WASM -> HoI4 script pipeline. It ships DOOM shareware Episode 1 plus Freedoom MAP01, and the creator says keyboard input is unreliable but the game is fully playable. The modified C source is on a hoi4 branch of Yard1's doomgeneric fork; the creator says the full transpiler pipeline will be released later.

How it works

doomgeneric C source -> WebAssembly -> transpiled into HoI4 script; renders and runs entirely within the HoI4 scripting/GUI system

Requirements & limitations

Hearts of Iron IV (Steam); subscribe on Workshop (~197 MB)

Original sources

• Source code ↗
• Project page ↗
• doomgeneric upstream ↗

Evidence limits

Primary sources reviewed on 2026-10-08 (steamcommunity.com, api.steampowered.com, github.com, ixbt.games). No independent catalogue play-test or binary safety review was performed.

Code and releases are linked, not hosted here. Game files and footage retain their owners’ rights.