Hearts of Iron IV, also commonly known as HOI4, is a 2016 grand strategy video game developed by Paradox Development Studio and published by Paradox Interactive. It is the sequel to 2009’s Hearts of Iron III and the fourth main installment in the Hearts of Iron series. Like previous games in the series, Hearts of Iron IV is a grand strategy wargame that focuses on World War II. The player can control any country in the world, starting either in 1936 or 1939. Players have the option of following a nation’s historical path, or leading various non-historical paths. The game allows players to take part in both single-player and multiplayer modes.
By May 2018, the game had sold a total of one and a half million copies worldwide. As of November 2025, the game has sold over seven million copies on Steam alone. Since its release, Paradox has released large amounts of downloadable content for Hearts of Iron IV.
Hearts of Iron IV is a grand strategy wargame that revolves around World War II. The player may play as any nation in the world, starting on January 1st, 1936, or August 14th, 1939 start dates in single-player or multiplayer.
Hearts of Iron IV was announced in 2014 and was originally slated for a late 2015 release. At E3 2015, creative director Johan Andersson confirmed that the game would be pushed back from its original release window, with the new release date being scheduled for the first quarter of 2016. This was an attempt to resolve several issues encountered with the game. In March 2016, it was announced that the game, built with the Clausewitz Engine, would be released on 6 June 2016, which was the 72nd anniversary of the Normandy landings.
Hearts of Iron IV has also received many free updates since the launch of the game (17 major with over 100 in total). These often coincide with DLC releases, and add new content or change content for the base game.
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