DLC

鋼鐵雄心4的DLC界面

可下載內容（Downloadable content） (DLC)，是由Paradox Development Studio（PDS）製作的內容，是對鋼鐵雄心4的擴展或添加內容。它們本質上是模塊化的，這意味着玩家可以通過通過啟動器勾選是否需要特定的DLC進行遊戲。DLC通常隨附一個免費補丁更新，該補丁為玩家提供了大多數新的更新內容，以免阻礙遊戲的可玩性。大多數DLC均被視為可選購買內容。

多人遊戲也從這種兼容性中受益，也就是說，如果主機具有玩家沒有的DLC（擴展包和風味包），則其他玩家將享受與主機一樣的遊戲體驗。

注意：有關特定DLC的更多詳細信息可以通過單擊其圖標來獲取。

基礎遊戲

與遊戲相關的所有DLC都需要基礎遊戲。儘管單位包DLC/音樂DLC可以與任何遊戲版本一起使用，但擴展包和風味包DLC不能在其發行版本之前使用。

Title and Quick description
重定向 Template:圖標 鋼鐵雄心4（Hearts of Iron IV） 發布於 2016-06-06. Total strategic war: War is not only won on land, sea and in the air. It’s also achieved in the hearts and minds of men and women. Authentic real-time war simulation: Let the greatest commanders of WW2 fight your war with the tools of the time; tanks, planes, ships, guns and newly discovered weapons of mass destruction. Assume control of any nation: Choose from the greatest powers striving for victory, or the small nations trying to weather the storm. Turn the world into your battlefield: Experience the full WWII timespan in a topographical map complete with seasons, weather and terrain. Snow, mud, storms can be both your strong ally and a ruthless enemy. Negotiate or force your will: Experience the advanced politics and diplomacy systems, form factions, engage in trade for resources and appoint ministers to your party. Intense Online Combat: Battle in both competitive and cooperative multiplayer for up to 32 players. Featuring hotjoin and cross-platform multiplayer. Give your nation a unique edge: Experience the flexible technology system, where all major powers get their own unique identity. Develop detailed historic tanks and planes through research and army experience.
鋼鐵雄心4：Mobilization Pack（Hearts of Iron IV: Mobilization Pack） Includes the base 重定向 Template:圖標 Hearts of Iron IV game and the following expansions: 重定向 Template:分欄

擴展

Expansions change the game considerably; introducing new and improved gameplay mechanics as well as many kinds of flavor and various balance tweaks (included in the accompanying free patch).

Title and Quick description
Götterdämmerung Paradox Steam Released on 2024-11-14. Players can write new histories of Germany, Austria, Hungary and Belgium. Build the industrial and research foundation to survive the world's greatest conflict. Pursue exciting new research and military options, opening new paths for devastating new weapons and dramatic raids on strategic targets. 重定向 Template:國旗 Larger German Focus Tree: Revised national focuses and alternate historical paths for one of the most played nations in Hearts of Iron IV. These political paths include new monarchist content, a restored democratic Germany and alternate fascist militarist paths. More character driven events add flavour to the war's central player. 重定向 Template:國旗 Revised Austrian Focus Tree: New alternate histories for Austria free of German control, as well as content for surrounding countries that were once part of the Habsburg Empire. There is also a revised historical path for AI controlled Austria. 重定向 Template:國旗 Hungarian Focus Tree: Rebuild the nation, using technology to overcome manpower shortages. Reform the Austro-Hungarian Empire and forge a powerful, unified faction. 重定向 Template:國旗 Belgian Focus Tree: Resist or welcome German supremacy. Draw on the natural wealth of the Congo and build potential for an African government-in-exile. Special Projects: Build scientific facilities to pursue advanced research in special projects, assigning scientists to further your war effort. Special projects include nuclear physics, advanced aircraft, rocketry, advanced tanks and artillery, naval engineering and electronics. Raids: Attack important enemy targets with carefully planned strikes. Enemy ports, industrial structures, research facilities and special resource collection areas are potential targets for bombing strikes, commando raids or paratroop attacks. And more: New structures and buildings are visible on the map, AI players are better at planning attacks, new changes to the use and effectiveness of atomic warfare.
以力御暴（Arms Against Tyranny） Paradox Steam Released on 2023-10-10. 重定向 Template:國旗 Finnish Focus Tree: Relive the defining moment of Finnish history, defying the odds in a war against a much more powerful Soviet adversary. 重定向 Template:國旗 Swedish Focus Tree: The richest of the Nordic nations, Sweden is well-suited to a path of vigorous neutrality and to serve as both an arms designer and arms trader. 重定向 Template:國旗 Norwegian Focus Tree: Relive the historical challenge of a young industrializing nation trying to stay neutral in the face of German aggression or prepare for war by quickly arming to resist the war that is coming to your doorstep. 重定向 Template:國旗 Danish Focus Tree: A long-standing policy of neutrality leaves Denmark unready for a continental war. Pursue the course of domestic harmony through a strong welfare state and agile diplomacy, or throw in with the democratic Allies, rearming for the coming storm. 重定向 Template:國旗 Icelandic Focus Tree: Military Industrial Organizations: Military Industrial Organizations will offer new ways to streamline production lines or develop high-performance weapons systems with advantages on the battlefield. International Market: In the new International Market, you can become an arms exporting powerhouse, selling weapons to other nations in return for civilian factory output, increasing your own industrial production at home while fueling the fires of war abroad.
唯有浴血（By Blood Alone） Paradox Steam Released on 2022-09-27. Build a new empire, resist foreign aggression or explore the limits of neutrality. The expansion adds new alternate history options and gameplay variety for three nations, as well as other significant changes. 重定向 Template:國旗 Updated Italian Focus Tree: Follow the historical path of Mussolini's Italy or rewrite history by restoring power to the monarchy, leading a Communist revolution or promoting democracy. 重定向 Template:國旗 Ethiopian Focus Tree: Defy the odds to defeat the Italian invader or resist the conqueror from abroad using unique Government in Exile abilities. 重定向 Template:國旗 Swiss Focus Tree: Surrounded by France, Germany and Italy, the mountain nation of Switzerland finds strength in its neutrality, balancing competing factions and overtures from the great powers. New Peace Conference Options: Demilitarize zones of the map or entire nations, bid on the capital ships of defeated powers, or claim control of enemy resources or factories as reparations. Aircraft Designer: Design and build your own planes, from nimble interceptors that prioritize speed to durable bombers crafted to unload tons of destruction from high above. Unit Medals: A log of each division's accomplishments lets you track their performance, and even allows you to award unique medals to division commanders for their actions in the field. Embargo Interaction: Embargo your enemies with a new diplomatic interaction, preventing them from trading with you if they have generated enough world tension. New Unit Models: Over 20 new unit models for Italy, Ethiopia, and Switzerland New Plane Models: 67 new plane models 12 New Music Tracks
寸步不退（No Step Back） Paradox Steam Released on 2021-11-23. The Second World War's hardest fighting was on the Eastern Front of Europe. This expansion adds greater detail for many nations in Eastern Europe, unique game systems to reflect Soviet politics, and many improvements to the military aspect of the game. 重定向 Template:國旗 Updated Soviet National Focus Tree. 重定向 Template:國旗 Updated Polish National Focus Tree. New Baltic National Focus Trees: Shared alternate history paths for 重定向 Template:國旗, 重定向 Template:國旗 and 重定向 Template:國旗, as well as unique paths for each. Army Officer Corps: Build a general staff, drawing on the talents and expertise of available officers to take advantage of changes in technology and tactics. Army Spirits: Emphasize certain characteristics of your military arms, adding general bonuses to certain units types or even aiding division design. Supply System Updates: Scorched Earth tactics, floating harbors and special supply units added to the logistics system. Tank Designer: Design your own armored force using modules prioritizing speed, gun power, armor or even production cost. Railway Guns: Commission the grandest, most prestigious of artillery pieces, uniquely designed to deal with entrenched foes, and fortified positions.
重定向 Template:圖標 共赴勝利（Together for Victory） 發布於 2016-12-15. New national focus trees and events: Focus trees for 加拿大, 澳大利亞, 新西蘭, the 英屬印度 (India) and 南非. Alternate historical path: For each of the Dominions, with options to stay loyal to Great Britain, or forge a new, more independent destiny. New autonomy system: Giving subject states degrees of independence from a foreign master. Changes to Lend-Lease: Allows to ask allies to send you your desperately needed equipment. A Spearhead battleplan command: Allowing more control over grand encirclements and punching through enemy lines. Technology sharing: Allows Commonwealth nations to quickly catch up with British assistance.
重定向 Template:圖標 玉碎瓦全（Death or Dishonor） 發布於 2017-06-14. Four New Focus Trees: Experience the war from the difficult perspectives of 匈牙利王國, 羅馬尼亞王國, 捷克斯洛伐克, and 南斯拉夫. Equipment Conversion: Update your arsenal by converting older units - or make use of captured enemy vehicles and gear. New Diplomatic Interactions: License military technology to bring other nations' weapons to the field or sell your advances to the highest bidder. New Puppet Interactions: Fascist countries get new subject levels like Reichskommissariat, with access to licenses, industry and strategic resources. The instated governments are held in an iron grip, making it harder for them to break free. New Music and Art: 3 new thematic musical tracks from composer Andreas Waldetoft, new art content for the four focus nations, and new troop voiceovers.
重定向 Template:圖標 喚醒勇虎（Waking the Tiger） 發布於 2018-03-08. National Focus Trees for China: Guide File:China.png 中華民國 or the 中共 through the war, guided by your own vision of the future. Modified Focus Trees: 德意志國 and File:Japan.png 日本, two major Axis powers now have alternate history paths, including the chance to depose Hitler or restore democracy to Japan. General Traits and Abilities: Generals』 traits can now unlock powerful Command Power abilities, allowing great flexibility and creativity. Decisions and Missions: Historical decisions and national missions give new places to spend Political Power, from domestic politics to start special projects. And more: Scavenge equipment from the battlefield, use Volunteer Air Corps, as well as new music and art.
重定向 Template:圖標 炮手就位（Man the Guns） Paradox Steam 發布於 2019-02-28. Major Alternate Paths: Revive the Old Confederacy as the 美利堅合眾國 and provoke a new civil war, or hasten decolonization of the 聯合王國. Ship Design: Research new components and refit older vessels to take advantage of new knowledge. Outfit your submarines with snorkels or improved stealth. Admiral Traits and Skills: Tailor and level up your Admirals with new traits and skills. Governments in Exile: Welcome a government in exile to your democracy, boosting their legitimacy in return for more manpower and elite troops fighting to free their homeland. Other National Focuses: New national focuses for The 荷蘭 and 墨西哥. Naval Mines: Protect your coasts from invasion or assault with anti-ship mines, or clear a path through enemy mines before you make the big push. Shipping route controls: plot new routes for your shipping and navies by marking areas you want to avoid. Naval Treaties: Struggle to keep the peace by following internationally agreed upon rules, or creatively defy the world consensus by exceeding your limits. Amphibious Landing Vehicles: Add power to your beach landing by researching and producing specialized combat vehicles for your marines. New Music: Original music composed specifically for the Man the Guns expansion.
重定向 Template:圖標 抵抗運動（La Résistance） Paradox Steam 發布於 2020-02-25. New Focus Trees for France: New National Focuses for Free 法國 and the 維希法國 Regime, as well as an option for conservatives to restore the old French Monarchy. More in Depth Spanish Campaign: New National Focuses for 西班牙共和國 and 西班牙國, as well as an expanded Spanish Civil War that can spiral into a wider conflict.. Portuguese Focuses: Navigate the pressure of the World War, or involve yourself in the Spanish Conflict with the new Focus Tree for 葡萄牙. Espionage: Use you Intelligence Agency to train spies to specialize in certain types of information warfare and develop passive resistance to enemy espionage, then send them on special operations. Support Resistance: Use your agents to assist allied resistance movements, giving them what they need to damage the enemy. Collaboration Governments: Use your agents to prepare the ground for collaborators to fill the void once you’ve conquered your target. Code Cracking: Decrypt enemy communications to gain short term battlefield advantages. Recon units: Scout planes can provide useful information on nearby areas while armored cars help in detecting and suppressing resistance activities.

Flavor packs

Flavor packs add new events, event pictures and unit models often specific to one nation or group.

Title and Quick description
Poland: United and Ready (A free DLC) 發布於 2016-06-06. Focuses on 波蘭 Adds a unique national focus tree. 3D art for infantry and some more well known tanks and planes. 2D art for tanks & planes, complete with flavor names. 2D art for ministers, generals and country leaders. Complete Polish voice acting for military units. Some additional events.

Music packs

Music packs add new music created after the game's release to the game's soundtrack.

Title and Quick description
Pre-Order Pack (Not available for purchase) 發布於 2016-06-06. 重定向 Template:分欄
Sabaton Soundtrack 發布於 2016-06-06. Composed by Sabaton: Adds 5 World War II themed tracks by Sabaton that play during the game. (can't be used on LP videos due to 3rd party copyright). 重定向 Template:分欄
Sabaton Soundtrack Vol. 2 發布於 2017-01-26. Composed by Sabaton: Adds 10 tracks illustrating moments of World War II with passion and power chords! (can't be used on LP videos due to 3rd party copyright). 重定向 Template:分欄
Radio Pack 發布於 2019-06-04. Adds 35 new songs spread across three faction specific radio channels, each with their own unique look and design: Allies Radio Station Axis Radio Radio Comintern
Allied Speeches Pack 發布於 2020-06-04. Monumental and inspirational moments from history come alive in your campaign game. Set to activate when certain in-game conditions are met, the Allied Speech Pack brings you closer to the past. 13 total speech excerpts with over 70 minutes of speech taken from the darkest days of the last century, including: 重定向 Template:分欄

Cosmetic packs

Cosmetic packs add graphical enhancements to the game, whether by additional unit models, landmarks or portraits.

Title and Quick description
Colonel Edition Upgrade Pack (Not available for purchase) 發布於 2016-06-06. Heavy Cruiser Pack: Adds 7 heavy cruisers available for both Axis and Allies, including Exeter, Prinz Eugen and Mogami. Tank Pack: Adds 40 tanks, ranging from light to super-heavy (8 units for each nation), for: 重定向 Template:分欄
Anniversary Pack (A free DLC) 發布於 2017-06-06. 20 new portrait selections for generals and leaders across nations in Africa, Asia, Europe, and South America. 20 new custom division icons. New voiceovers for troops while playing as 波蘭.
Axis Armor Pack 發布於 2019-06-04. Axis Armor Units: Adds 53 armor models for 重定向 Template:圖標 fascist regimes: 重定向 Template:分欄 Axis Tank Units: Adds 8 tank units to 德意志國, including the King Tiger and the Maus super heavy tank.
Allied Armor Pack 發布於 2020-06-04. Allied Armor Units: Adds a number of new armored and tracked vehicles for the Allies and Comintern powers: 重定向 Template:分欄 Allied Tank Units: Adds 32 tanks (8 units for each nation), ranging from light to super-heavy, for: 重定向 Template:分欄

E-books

E-books are books written based on the Hearts of Iron IV game. These, however, do not impact the actual game in any way whatsoever.

Title and Quick description
War Stories (part of Pre-Order Pack) Paradox account 發布於 2016-05-16. Written by Aaron Rosenberg: A branching narrative (gamebook) about a young British pilot during the Battle of Britain. Be wise! The decisions you make will influence which skills you learn, your relationships with other characters and even the story’s outcome.
Art of War (Not available for purchase) 發布於 2016-06-06. A 23-page book with art from the creation process of Hearts of Iron IV.

File names

/Hearts of Iron IV/dlc 中 DLC 文件的對應關係表（粗體為擴展包）：

1. 重定向 Template:摺疊