Hearts of Iron IV Expansion Pass 3 adds Linux and Steam Deck support with new America, Romania content

Paradox Development Studio has released Hearts of Iron IV Expansion Pass 3, a content bundle for the World War II grand strategy game that adds fresh national focus paths and confirms continued native Linux and Steam Deck support. The pass centers on The Giant Wakes, which gives the United States a new gameplay path out of the Great Depression, alongside content for Canada, Central America, and the Caribbean. The first individual pack, To The Bitter End, releases November 19, 2026, focusing on Romania's political factions, oil economy, and military units with new 3D models and music tracks.

The expansion pass is priced at $43.99 USD with To The Bitter End available separately at $5.99 USD. Additional upcoming content includes The Price of Peace, featuring League of Nations mechanics and national content for Burma, South Africa, Yugoslavia, and Venezuela. The pass also includes Songs of Liberty, a music pack with three reimagined classic US songs currently available to pass owners.

Linux gaming and content breakdown

• Native Linux support: Hearts of Iron IV Expansion Pass 3 maintains native Linux compatibility through the Clausewitz engine, not relying on Proton or Wine translation layers for core functionality.
• Steam Deck verification: The expansion pass explicitly supports Steam Deck, indicating Paradox continues to validate controller input, UI scaling, and performance profiles for the handheld's 1280x800 display and AMD APU.
• Modding community integration: To The Bitter End was developed with three community modders (Marijn Vroegh, Vlad Alexandru Catalin, and Daniel Norrman), showing Paradox's hybrid professional-community content pipeline.
• Content delivery structure: The pass uses a staggered release model with individual pack pricing ($5.99 USD) alongside the full pass ($43.99 USD), allowing granular purchasing for Linux players who may not want all content.

Why it matters

Native Linux support for major Paradox grand strategy titles remains relatively rare in the AAA space, making this expansion pass notable for Linux gamers who prefer not to rely on Proton compatibility layers. The explicit Steam Deck mention signals continued commercial viability for Linux-native games in Valve's handheld ecosystem, which runs SteamOS based on Arch Linux. For the broader Linux gaming landscape, Paradox's sustained investment in native ports alongside Windows and Mac helps maintain platform parity expectations for strategy game enthusiasts.