As a grand-scale Real-Time Strategy and simulation game released in 2016, you command any nation during World War II. The core loop involves managing political focus trees, industrial output, resource allocation, and designing custom military units for land, sea, and air warfare. Its distinct feature is the deep simulation of the entire national war machine, offering players agency to either follow or rewrite WWII history through strategic leadership and complex international maneuvering.
The gameplay loop centers on managing the complex needs of a nation preparing for or engaged in total war. Players must balance national focus trees to determine political and industrial direction, manage resource allocation, and design military units from the ground up. This simulation aspect extends to logistics, research, and the deployment of ground forces, naval fleets, and air wings across a detailed world map.
The game distinguishes itself through its deep simulation of the historical period, emphasizing the intricate interplay between industry, politics, and military doctrine. Players are not simply commanding armies; they are managing the entire war machine of a nation. A significant mechanic involves designing custom divisions, specifying the exact composition of tanks, infantry, and support units that will form the backbone of your armies. Furthermore, the political system allows for complex international relations, including the formation of alliances, ideological alignment shifts, and the execution of strategic diplomatic actions.
Players assume the role of the supreme leader, dictating strategy from the highest command center down to the tactical battlefield level. The atmosphere is one of high-stakes global tension where every decision—from where to build a new factory to which technology to prioritize—can have cascading effects on the global balance of power. The central challenge is navigating the historical pressures and opportunities of the era, allowing players the agency to either relive established history or attempt to fundamentally change the fate of the world.
While the core experience is robust, the game has received substantial post-launch support. As of the current date, the main game is supported by 1 official downloadable content pack and 11 major expansions. This additional content introduces new mechanics, focuses, and regional depth to various aspects of the simulation, expanding the scope of the World War II experience available to the player.
This title appeals to players who enjoy deep, complex simulation layered over a real-time strategy framework. Success requires meticulous planning across economic, political, and military fronts, making it suitable for those who prefer detailed management over fast-paced tactical action.
Victory is at your fingertips! Your ability to lead your nation is your supreme weapon, the strategy game Hearts of Iron IV lets you take command of any nation in World War II. From the heart of the battlefield to the command centre, you will guide your nation to glory and wage war, negotiate or invade. You hold the power to tip the very balance of WWII.

Imagine a world where the White Lion of Prague was prepared to face German aggression.

Build the industrial and research foundation to survive the world’s greatest conflict In Hearts of Iron IV: Götterdämmerung. In this expansion, players can write new histories of Germany, Austria, Hungary, Belgium, and Congo. Pursue exciting new research and military options, opening new paths for devastating new weapons and dramatic raids on strategic targets.

It is 2020. The world holds it’s breath as a newly discovered coronavirus disease spirals out of control, and spreads like wildfire worldwide. Economies plunge into another recession, societies further radicalize, and worst of all, political instability is on the rise. Surely nothing worse could happen, right? With the collapse of Saudi Arabia into civil war, the Coronavirus Pandemic, and the nationwide riots against police brutality, at a scale worse than the 1992 LA riots, the United States of America is facing it’s darkest hour. It’s collapse is inevitable, and the world balance is at stake. With the death of the American Hegemony, her modern rivals eye their historic territories with an unfound vigor.

Red Dusk is a Game Mod for Hearts of Iron IV that imagines a world where the August Coup succeeded and kept the Soviet Union surviving past its historical dissolution. Limping past the 90s, the Soviet Union deals with factionalism and the risk of economic collapse, while the United States experiences internal strife from the sudden rise of the Reform Party and the indecisive of President Quayle.

An alternate history mod for Hearts of Iron IV by Paradox Interactive that asks the question: "What if Germany had won the First and Second World War?"

Paradox Interactive has teamed up with talented modders from the Hearts of Iron IV community to release a content pack with new art assets for the Soviet Union.

Explore alternate WWII histories in "Trial of Allegiance" for Hearts of Iron IV. Lead South American nations like Argentina, Brazil, or Chile. Build a superpower or join global blocs, using regional resources and manpower for a unique, glorious future.

Write a new history of Scandinavia and Finland in Arms Against Tyranny, a new expansion for Hearts of Iron IV. Build a war machine to defy potential aggressors, or chart a neutral course with an arms industry fueling war far from your own shores.

Build a new empire, resist foreign aggression or explore the limits of neutrality in Hearts of Iron IV: By Blood Alone. This new expansion for Paradox Interactive’s World War II grand strategy wargame adds new alternate history options and gameplay variety for three nations, as well as other significant changes.

Red Flood is a mod for Hearts of Iron IV set in an alternate timeline where the Great War ended in stalemate. The year is now 1936 and Europe once more is on the brink of war.

Welcome to Pax Britannica: An Imperial Timeline, an alternate history science fiction mod for Hearts of Iron 4.

Millennium Dawn is a multi-mod project set in 2000 and continues to the modern day and beyond. The mod boasts new and unique tech trees, focus trees, events, and decisions to immerse you in the intricacies of the modern era.

The bitter fighting of the Eastern Front is given new depth and variety in No Step Back, the expansion to Hearts of Iron IV. With new alternate history paths and game systems, this eagerly awaited add-on presents new challenges for fans of Paradox Interactive’s best-selling grand strategy wargame. The centerpiece of No Step Back is a series of new National Focus Trees, giving players many new ways to imagine the course of World War II in Eastern Europe. Major nations have been entirely reworked to offer unique challenges and original histories.

The New Order: Last Days of Europe is a Hearts of Iron IV mod, that is set in an alternate timeline where Nazi Germany utterly wins World War II, but quickly loses the peace. The New Order is a narrative-driven mod that focuses on the fallout of an Axis victory and its effects on the world, leading to a three-way Cold War in the 1960s. The mod is known for being incredibly ambitious and features many new mechanics and large amounts of events, paths and characters.

Three new national focus trees are the heart of this expansion. The minor powers of Bulgaria, Greece and Turkey each have new alternate historical paths to follow as they resist incursions into the strategic sea lanes of the Back and Aegean seas.

Thousand Week Reich is an alternate history mod that attempts to bring a sense of grounded, gritty realism to the age-old trope of an Axis 'victory' in the Second World War. Originally based on a series of maps by AP246/Proximexo, the TWR mod aims to explore a more grounded and ‘realistic’ version of the trope of a victorious Nazi Germany. Enter the world of TWR in 1952 and fight to hold onto the disintegrating remains of German ‘New Order’ or rise up to the task of defeating the oppressor and liberating Europe from Nazi tyranny.

What if the Soviets Won? Red World imagines a modern scenario in which the Soviet Union won its cold war against the United States. Despite becoming our globe's sole superpower, the Soviets face the daunting task of maintaining ultimate control. It seems that in the coming years everything might just be slipping away... In memory of Kaiser1871, the original creator of Red World and a dear friend to us all. This fan fork will continue to expand and update Red World along Kaiser's intended plans and wishes, making it a fun experience for everyone to enjoy once again to its fullest!

Bust through the Ardennes or encircle the Axis in style with this new cosmetic pack for Hearts of Iron IV . Including tanks previously only available in the Colonel Edition, this pack adds a number of new armored and tracked vehicles for the Allies and Comintern powers.

KaiserreduX started out in late 2019 as a collection of various submods for Kaiserreich, later evolving into a unified submod turned fork and eventually - thanks to the continuous addition of new content, wider sweeping changes to lore and setting, and ever widening differences in design philosophies between the original base of the KR mod and KX - into a wholly separate entity that is in no way affiliated with KR beyond sharing the conceptual ideas for the timeline, albeit with many differences, and the base for the mod, so do not run the two mods together; KX is a standalone product. While KX has kept a considerable amount of pre-existing KR lore, much of which has changed by now, it has also introduced a lot of new elements and additions going beyond the scope of the timeline created back in the days of Kaiserreich for Darkest Hour.

The enemy has installed a puppet government in an allied nation. Brave individuals promise to fight against their occupiers and oppressors. Use your agile espionage skills to support the work of La Résistance.
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