Developer diaries
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Battle for the Bosporus
La Résistance
Man the Guns
Waking the Tiger
Death or Dishonor
Together for Victory
Base version
Battle for the Bosporus La Résistance Man the Guns Waking the Tiger Death or Dishonor Together for Victory Base version Developer diaries are articles, sometimes accompanied by videos, published by Paradox to describe the game design in detail.
No Step Back
All developer diaries about the No Step Back expansion and patch 1.11 (aka Barbarossa).
- Patch 1.11 (Barbarossa)
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 1 | Early look at supply and the coming year | An early look at the new supply/war system | 2021-04-07 |
| 2 | Poland Focus Tree Rework Part 1/2 | Introduction of the reworked Polish focus tree coming with the free update | 2021-04-14 |
| 3 | Poland Focus Tree Rework Part 2/2 | Look at the changes to the Polish tree in the upcoming DLC | 2021-04-21 |
| 4 | Tank Designer | Look at the changes coming to tank design with the upcoming DLC | 2021-04-28 |
| 5 | Combat and Stats changes | A look at changes coming to combat | 2021-05-05 |
| 6 | The Baltic States 1/2 and Poland 3/2 | A first look at changes coming to the Baltic states, and more on Poland | 2021-05-12 |
| 7 | The Baltic States 2/2 | More changes coming to the Baltic states | 2021-05-19 |
| 8 | PdxCon Recap and Team update | Recap of PdxCon announcements and some statistics updates | 2021-05-26 |
| 9 | PDXCON - HoI Q&A Panel Transcript | PdxCon Q&A with the devs | 2021-05-27 |
| 10 | Bag of Tricks #1 | Small features and QoL improvements to the game | 2021-06-09 |
| 11 | Officer Corps | New Officer Corps system and changes to Experience | 2021-06-16 |
| 12 | Officer Corps #2 | More information about the Officer Corps | 2021-06-23 |
| 13 | Supply and Mulberry Harbors | Deeper look at the new supply system | 2021-06-30 |
| 14 | Soviet Union Historical and Common Branches | A look at the historical and shared parts of the new Soviet Focus Tree and new mechanics for the Soviet Union | 2021-08-04 |
| 15 | Soviet Union Opposition | New focus branches for the communist opposition against Stalin | 2021-08-11 |
| 16 | Soviet Union Exiles | New focus branches for the return of the Whites or the Tsar | 2021-08-18 |
| 17 | Bag of Tricks #2 | Changes to weather, QoL changes concerning equipment and building in allied territories / Departure of Game Director Dan "Podcat" Lind | 2021-08-25 |
| 18 | Traiiiiins | A further look at trains, air missions to attack them, and supply distribution | 2021-09-01 |
| 19 | Railway guns never tire | New Railway Gun Land Unit Type | 2021-09-08 |
| 20 | Bag of Tricks : the Sequel | Changes to Redeployment, Scorched Earth, and General Preferred Tactics | 2021-09-15 |
| 21 | Combat Changes & Soviet Exiles | Changes to Combat and Soviet Exiles focus branch | 2021-09-29 |
| 22 | Poland is not yet lost - No step back AAR | Recap of CraniumMuppet's experience with Poland in the new update | 2021-10-06 |
| 22.5 | Sub-Developer-Diary - Combat targeting iteration | Further balancing and changes to targeting | 2021-10-06 |
| 23 | Officer Corps Recap & AI Improvements | Recap of Officer Corps changes and introduction of AI improvements | 2021-10-13 |
| 24 | Modding Changes | Introduction of the character system, modability of NSB features | 2021-10-20 |
| 25 | Loading Screen Art and more | Process of creating new loading screens, A look at some portraits and achievements of NSB | 2021-10-27 |
Battle for the Bosporus
All developer diaries about the Battle for the Bosporus country pack and patch 1.10 (aka Collie).
- Patch 1.10 (Collie)
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 1 | Greece | Description of Greek focus tree and briefly talking about pathways. | 2020-09-09 |
| 2 | Bulgaria | Description of Bulgarian focus tree and briefly talking about pathways. | 2020-09-16 |
| 3 | Turkey | Description of Turkish focus tree and briefly talking about pathways. | 2020-09-23 |
| 4 | Yugoslavia and Romania | Description of Yugoslav focus tree changes and briefly talking about pathways and talking about minor changes to Romania | 2020-09-30 |
| 5 | Art and Achievements | New art, music, and achievements. | 2020-10-07 |
| 6 | 1.10 ‘Collie’ | Full changelog | 2020-10-14 |
- Patch 1.10 post release
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 7 | Telemetry | Short description of Telemetry of how player behaviour changed since the DLC release | 2020-10-21 |
| 8 | New year update | Statistics after Battle for the Bosporus, general view on 2021. | 2021-01-20 |
| 9 | 5th Anniversary | Hearts of Iron IV 5th Anniversary and patch | 2021-06-02 |
La Résistance
All developer diaries about the La Résistance expansion and patch 1.9 (aka Husky).
- Patch 1.9 (Husky)
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 1 | Back From Summer! | Back from vacation to a new round of DDs | 2019-08-21 |
| 2 | France Rework | Rework of French focus tree | 2019-08-28 |
| 3 | Resistance and Compliance | Rework of the Occupation system | 2019-09-04 |
| 4 | Free France and Vichy | Rework of Free France and Vichy France | 2019-09-11 |
| 5 | Policing Garrison Rework | Rework of Resistance Suppression and Garrisons | 2019-09-18 |
| 6 | ¡Viva España! | Nationalist Spain Focus Tree | 2019-09-25 |
| 7 | ¡No Pasarán! | Republican Spain Focus Tree | 2019-10-02 |
| 8 | Armored Cars - The new horsey boys | New Armored Car Land Unit Type | 2019-10-09 |
| 9 | PdxCon & Moving Madness | Talks about moving offices and talks about what there going to talking about in PdxCon | 2019-10-16 |
| 10 | Back from PdxCon | Talks about what they talked about at PdxCon and talks about their new offices | 2019-10-23 |
| 11 | The Intelligence Agency | New Intelligence Agency | 2019-10-30 |
| 12 | Operatives and Missions | New Operatives and Missions they can perform | 2019-11-06 |
| 13 | Focus Tree Navigation | Focus Tree Navigation | 2019-11-13 |
| 14 | Operations | New Operations | 2019-11-20 |
| 15 | Collaboration, Compliance and Coups | Coup and Collaboration Operations | 2019-11-27 |
| 16 | Scout Planes and breaking the Enigma | New Scout Plane Air Unit Type and Additions & Changes to Intel and Cryptology | 2019-12-04 |
| 17 | Intel | More changes to Intel | 2019-12-11 |
| 18 | Portugal | New Portuguese Focus Tree | 2019-12-18 |
| 19 | Bag of Tricks | Quality of Life Changes like Automatic MEFO Bills, Exercise Auto Stop, and Searchable & Zoomable Focus Trees | 2020-01-15 |
| 20 | Formables and Releasables | New Formable Nations and Releasable Nations | 2020-01-22 |
| 21 | LaR Music and Art | New Art and Music | 2020-01-29 |
| 22 | Achievements | Achievements | 2020-02-05 |
| 23 | LaR UK AAR | How it Feels to Play in the New Update | 2020-02-12 |
| 24 | AI & Feature Updates | Changes to AI and some Features in the Update | 2020-02-19 |
| 25 | Modding & 1.9 Patchlog | 1.9 Patchlog and New Modding Features | 2020-02-21 |
- Patch 1.9 post release
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 26 | LaR Post Release and Statistics | Statistics on LaR and announcement 1.9.1 beta | 2020-03-04 |
| 27 | 1.9.1 Beta Patch Update | Updates to Spanish focus trees and the Spanish Civil War | 2020-03-11 |
| 28 | 1.9.1 Beta Batch Update II | Fire Operatives and Nudger access | 2020-03-18 |
| 29 | 1.9.1 Beta Batch Update III | Info about patch 1.9.1, peace conferences and tech stealing | 2020-03-25 |
| 30 | 1.9.1 Beta Batch Update IV | Info about patch 1.9.1, 3D models and accessability | 2020-04-01 |
| 31 | 1.9.1 Patch & Roadmap update | Full info about patch 1.9.1 and the roadmap for future DLCs and updates | 2020-04-08 |
| 32 | 1.9.2 Beta + The Future | Beta patch available to test | 2020-04-15 |
| 33 | Patch 1.9.2 Husky Live | Patch release and current 'work from home' status | 2020-05-06 |
| 34 | 4th Anniversary + Patch 1.9.3 | HoI4s 4th anniversary: Some cool data, new armor and radio packs as well as patch to celebrate! | 2020-06-03 |
Man the Guns
All developer diaries about the Man the Guns expansion, patch 1.6 (aka Ironclad), patch 1.7 (aka Hydra) and patch 1.8 (aka Fork).
- Patch 1.6 (Ironclad)
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 1 | Man the Guns and PdxCon | General goals for the future expansion and patch | 2018-05-23 |
| 2 | Fuel | Information on fuel and new hotfix. | 2018-06-27 |
| 3 | God Save The King: British Focus Tree Rework | Reworked British focus tree, allowing for alternate-history paths. | 2018-07-04 |
| 4 | A Post-Colonial World:Map Changes and New Tags | Sweeping changes to the map along with the addition of more releasable tags. | 2018-07-11 |
| 5 | Custom Gameplay Rules | New Custom Gameplay Rules allowing the player to steer the game in the direction they want. | 2018-08-01 |
| 6 | MTG - Bag of Tricks | Smaller improvements to the game such as assuming leadership of a faction, manual focus cancellation, and naval and air exercises. | 2018-08-08 |
| 7 | Naval Access | Improvements to the naval theater of HOI4 including marking dangerous seazones and asking for naval access to ports. | 2018-08-15 |
| 8 | Mines and Minesweeping | Naval Mines added to the game along with minesweeping. | 2018-08-22 |
| 9 | USA focus tree rework | Reworked USA focus tree, allowing for alternate-history paths. | 2018-08-29 |
| 10 | Modding and Traits | Added trait system for admirals as well as more features for modders. | 2018-09-05 |
| 11 | Naval Production, Repair and Damage | Extensive changes to the naval theater with reworks of ship production, repair and damage. | 2018-09-12 |
| 12 | Exiled Government | Extend possibilities for exiled governments and more information about the British focus tree overhaul. | 2018-09-19 |
| 13 | Je Maintiendrai | Announcement of and information about the new Dutch focus tree. | 2018-09-26 |
| 14 | Amphibious Vehicles and Research | New Amphibious Tractors and Amphibious Tank. | 2018-10-03 |
| 15 | Naval Terrain | Overview of new terrain types for seas. | 2018-10-10 |
| 16 | Naval changes #1 | Overview of the different changes to naval warfare. | 2018-10-17 |
| 17 | Mexico focus tree | Announcement of and information about the new Mexican focus tree. | 2018-10-24 |
| 18 | Bag of Tricks 2 | Expeditionary Force Requests, Supervised States & On-map decisions. | 2018-10-31 |
| 19 | Ship Designer | Overview on modifications on the ship designer system. | 2018-11-07 |
| 20 | Naval Treaties and Ship Refits | Naval treaties effects on ship designing and refitting of obsolete ships | 2018-11-14 |
| 21 | Naval Rework #1 | New mission types and changes to the naval interface | 2018-11-21 |
| 22 | Bag of Tricks #3 | Dutch & British focus changes, ideology drift tweaks, map changes in Africa and the Balkans region. | 2018-11-28 |
| 23 | New Naval Combat | Rework of naval combat to be more informative and less decisive | 2018-12-06 |
| 24 | Subs and Convoy Raiding | Improvements to submarine convoy raiding | 2018-12-12 |
| 25 | Fuel Review and Motorized Artillery | Changes to the fuel implementation and the addition of motorized artillery units | 2019-01-09 |
| 26 | Tech Changes | Changes to the tech research system and the addition of new naval techs. | 2019-01-16 |
| 27 | Art and Music | New music, 3D models and 2D art to ramp up MTG's awesomeness. | 2019-01-23 |
| 28 | The Imperial Japanese Navy | An AAR of Archangel85's experience with the Imperial Japanese Navy in a MP session. | 2019-01-30 |
| 29 | Achievements | New goals to strive for, with the addition of 21 new achievements related to MTG. | 2019-02-06 |
| 30 | AI Plans | More AI strategy plans, and the integration of AI strategy into the Custom Game Rules menu. | 2019-02-13 |
| 31 | Man the Guns MEGA RECAP | Recap of everything that has been announced. | 2019-02-20 |
| 32 | 1.6 Patchlog | Full 1.6 "Ironclad" patch log and Reddit AMA highlights. | 2019-02-27 |
- Patch 1.6 post release
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 33 | MTG Post Release | Small telemetry information and what's planned for the patch. | 2019-03-06 |
| 34 | 1.6.1 Patch and Statistics | Full 1.6.1 "Ironclad" patch log, info about the 1.6.2 beta and player statistics. | 2019-03-13 |
| 35 | 1.6.2 Open Beta Patch | 1.6.2 open beta patch content and AI naval screen statistics | 2019-03-20 |
| 36 | 1.6.2 Update | 1.6.2 Highlights and patchlog | 2019-03-27 |
| 37 | 1.6.2 and Roadmap | 1.6.2 release, future roadmap and announcement of 1.7 "Hydra" and 1.8 "Husky". | 2019-04-03 |
- Patch 1.7 (Hydra)
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 38 | News from the Eastern Front | Patch 1.7 'Hydra' bringing 64 bit, AI frontline & player frontline UI changes | 2019-05-15 |
| 39 | 1.7 Update II - Technical boogaloo! | Further news on 64 bit, naval combat balance, optimization | 2019-05-22 |
| 40 | 1.7 Update and Radio & Armor Packs | Overview of the 1.7 update and 2 new art and music DLCs to celebrate the 3 year anniversary release | 2019-05-29 |
| 41 | 3 Year Anniversary! | 1.7 'Hydra' release, 3 year anniversary, response to some Twitter questions | 2019-06-05 |
| 42 | Tech bugaloo II - Dragonslaying! | 1.7.1 patch plans and overview of Out of Sync errors | 2019-06-12 |
- Patch 1.8 (Fork)
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 43 | New Launcher for Hearts of Iron IV | The new unified Paradox launcher to arrive on HoI4 | 2019-11-12 |
| 44 | 1.8 Patch (wut?!) & Focus Tree Navigation | The launcher patch and some balance changes | 2019-11-13 |
Waking the Tiger
All developer diaries about the Waking the Tiger expansion and patch 1.5 (aka Cornflakes).
- Patch 1.5 (Cornflakes)
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 1 | Future and Cornflakes | Podcat shares the team's (non-exhaustive) list of features to act as a future development roadmap for HoI4 | 2017-08-23 |
| 2 | Our development process | Sofia "KimchiViking" Höglund, HoI4's project lead, explains the development cycle, from design to implementation. | 2017-08-30 |
| 3 | A Product Manager's Role | "Firebolt", HoI4's product manager, on the intricacies of budgeting a game development. | 2017-09-06 |
| 4 | Chain of Command | Podcat on spicing things up in the HoI4 chain of command as part of patch 1.5 | 2017-09-13 |
| 5 | Stability and War Support | Stability and War support to replace National unity in the next patch | 2017-09-20 |
| 6 | Division Namelists | Pallidum, HoI4's game designer, inserting some flavor (and logic) to division names. | 2017-09-27 |
| 7 | Synthetic Dawn | Refinements to synthetic refineries and inter-linking infrastructure with resources | 2017-10-04 |
| 8 | Bag of Tricks #1 | Smaller improvements to the game: control groups, divisions consolidation, removal from faction, mini-map & pinging. | 2017-10-11 |
| 9 | A New Germany | Revised focus tree for Germany as part of requested alternate history options | 2017-10-18 |
| 10 | Bag of Tricks #2 | Another small features and improvements, this time with relation to equipment | 2017-10-25 |
| 11 | Airplanes and Lootboxes | Further improvement of air related aspects | 2017-11-01 |
| 12 | Decisive Action | Adding decisions, missions, crises and special projects to the game | 2017-11-08 |
| 13 | Nationalist China | The 1st focus tree for China (the nationalist path) as well as the announcement of Waking the Tiger expansion. | 2017-11-15 |
| 14 | Communist China | The 2nd focus tree for China (the communist path) along with an example of the new decision system in action. | 2017-11-22 |
| 15 | Leaders, abilities and Traits | Revamped and expanded trait system and the mysterious "red phone" icon (aka command power). | 2017-11-29 |
| 16 | Acclimatization and Special Forces | Troops are now affected by hot and cold climates, and new changes to special forces. | 2017-12-06 |
| 17 | Border Wars: The Last Warlord | More detail on the Chinese warlords. | 2017-12-13 |
| 18 | Christmas & Modding | Modding guide for the new decisions & missions system in patch 1.5. | 2017-12-20 |
| 19 | New German Divisional Namelist | Further improvement of incoming German unit namelist. | 2017-12-27 |
| 20 | Japan rework | A rework of the Japanese national focus tree. | 2018-01-03 |
| 21 | Bag of Tricks #3 | 3rd assortment of small improvements: attachés, extra ground crews, historical army insignias, and volunteer air wings. | 2018-01-10 |
| 22 | Manchukuo | The last unrevealed focus tree for Waking the Tiger: "Manchukuo". | 2018-01-17 |
| 23 | War Changes and game Difficulty | Changes to 3-way war handling and addition of 2 more difficulty settings. | 2018-01-24 |
| 24 | Sound, Music and Art for Tiger | On the topic of the artistic additions to Waking the Tiger. | 2018-01-31 |
| 25 | Naval Updates | Improvements of naval matters: losses and kills overview, convoys raiding, transports interception, and more. | 2018-02-07 |
| 26 | Formable Nations and Achievements | New goals to strive for: formable nations and some 18 achievements. | 2018-02-14 |
| 27 | Performance and AI | Performance and AI. | 2018-02-21 |
| 28 | Recap Episode | What is coming in Waking the Tiger and the 1.5 Cornflakes. | 2018-02-28 |
| 29 | Pre-Release and International Women's Day | Women's contribution during the second world war. | 2018-03-07 |
- Patch 1.5 post release
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 30 | Post-Release patch | Info about patch 1.5.1 | 2018-03-14 |
| 31 | 1.5.2 Update #1 | Info about patch 1.5.2: German border changes, commander XP gain changes, multiplayer desyncs, and more. | 2018-03-21 |
| 32 | 1.5.2 Update #2 and Modding Goodies | Info about patch 1.5.2: Air Balance and Changes, Nukes and Surrender, Manchukuo, Modding and more. | 2018-03-28 |
| 33 | 1.5.2 Update #3 and Telemetry | An updated beta and multiplayer telemetry | 2018-04-04 |
| 34 | 1.5.2, Future Roadmap and Ironclad | The return of the bullet list and possible future development roadmap | 2018-04-11 |
Death or Dishonor
All developer diaries about the Death or Dishonor country pack and patch 1.4 (aka Oak).
- Patch 1.4 (Oak)
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 1 | Reflections and Romania | First look at new DLC content | 2017-04-12 |
| 2 | License production and map changes | 1.4 Oak and the upcoming expansion will see map improvements and new ways of getting tech | 2017-04-19 |
| 3 | Announcement and AI Update #1 | Announcement of new content pack coming with the free 1.4 Oak along with details on AI improvements | 2017-04-26 |
| 4 | Hungary | Hungary changes coming up | 2017-05-03 |
| 5 | Equipment Conversion & War Update | Repurposing old material and improvements to the war overview | 2017-05-10 |
| 6 | Air Improvements | Air combat overhaul in 1.4 Oak | 2017-05-17 |
| 7 | Yugoslavia and Air Zones | Yugoslavia unique flavor and more details on aerial combat overhaul in 1.4 Oak | 2017-05-24 |
| 8 | Czechoslovakia and AI Update #2 | Let's have a look at Czechoslovakia and another AI update from Steelvolt | 2017-05-31 |
| 9 | Bits & Bobs | New subject levels, achievements, music, assorted QoL features and AI Update #3. | 2017-06-07 |
| 10 | 1.4 "Oak" Changelog sneak peek | Patch 1.4, aka Oak, changelog. | 2017-06-12 |
- Patch 1.4 post release
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 11 | Post-release chat | Bugs, new and old, dealt with in the 1.4.1 beta patch. | 2017-06-21 |
| 12 | Meet some new people | Beta patch status, preliminary gaming statistics post DoD and introduction of new team members | 2017-06-28 |
| 13 | We're back! | New beta patch with additional fixes, more portraits for free and an interim solution to an old AI transport problem | 2017-08-16 |
Together for Victory
All developer diaries about the Together for Victory country pack and patch 1.3 (aka Torch).
- Patch 1.3 (Torch)
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 1 | Future Focus | Focus for 1.3 / upcoming expansion along with general plans for the expansions beyond | 2016-09-23 |
| 2 | The Team | Presentation of the current HoI4 team lineup | 2016-09-28 |
| 3 | Memory Lane | A look at how some concepts have changed over the HoI series, such as: supply, upgrades, reinforcement and more. | 2016-10-05 |
| 4 | Blitz Command and Garrison Orders | Blitz Command coming in the next expansion, garrison orders in the free patch | 2016-10-12 |
| 5 | Oh Canada! | Canada and the Commonwealth | 2016-10-19 |
| 6 | Ally Down Under | Australia updated in Together for Victory | 2016-10-26 |
| 7 | South Africa and Continuous focuses | South Africa and Continuous focuses | 2016-11-02 |
| 8 | Autonomy | New levels for subject nations coming in Together for Victory | 2016-11-09 |
| 9 | India - Struggle for Independence | A closer look at the changes coming for India in Together for Victory | 2016-11-16 |
| 10 | New Zealand & Combat Log | New Zealand focus and tech trees as well as a combat log | 2016-11-23 |
| 11 | Together for Audio | Music and Audio in Together for Victory | 2016-11-30 |
| 12 | Cosmetic tags, art, gameplay and AI | One week to the release of Together for Victory! | 2016-12-07 |
| 13 | TFV AI Update #2 | Part 2 of AI bugfixes and updates for TFV | 2016-12-09 |
| 14 | TFV AI Update #3 | Part 3 of AI bugfixes and updates for TFV | 2016-12-12 |
| 15 | TFV AI Update #4 | Part 4 of AI bugfixes and updates for TFV | 2016-12-14 |
| 16 | Achievements & Patchlog | New Achievements and 1.3 changelog | 2016-12-14 |
- Patch 1.3 post release
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 17 | XMAS & Hotfix out! | It's time for holidays! Development diaries will be back again in 2017! | 2016-12-21 |
| 18 | Back from Christmas | 1.3.2 hotfix patch soon in public beta | 2017-01-11 |
| 19 | Squanching them bugs | Planned changes for 1.3.3 and general focus for the 1.4 Oak patch | 2017-01-18 |
| 20 | Getting started with modding | Havebeard goes over modding requests and modding tips for beginners | 2017-01-25 |
| 21 | 1.3.3 Modding Features | More modding features coming | 2017-02-01 |
| 22 | Patch 1.3.3 Update #1 | Changes done to industry, world tension and capitulation in the upcoming patch | 2017-02-08 |
| 23 | Patch 1.3.3 Update #2 | Details on QoL improvements, AI update, performance and optimizations done in the coming patch | 2017-02-15 |
| 24 | 1.3.3 Patch #3 | The patch should now be ready for release | 2017-02-22 |
Base game
All developer diaries about Hearts of Iron IV (base game), Patch 1.0, Patch 1.1 (aka Red Ball Express), and Patch 1.2 (aka Sunflower)
- Patch 1.0
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 1 | Our Vision | Design goals | 2014-02-07 |
| 2 | The Tools of War | Equipment, production and research | 2014-03-07 |
| 3 | Bringing WWII to the mainstream | Dogs! | 2014-04-01 |
| 4 | Land Doctrines | Doctrine paths | 2014-04-11 |
| 5 | Production Lines | How things get built | 2014-05-09 |
| 6 | Division Design | Division planner, division template | 2014-06-13 |
| 7 | Air Combat | Air war | 2014-07-11 |
| 8 | Experience and Variants | Production | 2014-08-08 |
| 9 | Vacation and Air tech | Air technology tree | 2014-09-12 |
| 10 | Naval Combat | Naval gameplay | 2014-10-10 |
| 11 | Map & Graphics | Visual aesthetics of the game | 2014-11-07 |
| 12 | Internal Politics | Internal affairs of a country | 2015-01-16 |
| 13 | Conscription & Training | Manpower, recruitment, training | 2015-02-20 |
| 14 | National Focuses | National focuses | 2015-03-20 |
| 15 | On the high seas | Naval battles | 2015-04-11 |
| 16 | World Tension | World tension, war justifications | 2015-05-08 |
| 17 | Johan Invades Germany | Barely a dev diary | 2015-06-12 |
| 18 | Army Planner | Creating and deploying units | 2015-06-26 |
| 19 | Equipment | How equipment works | 2015-07-03 |
| 20 | Soviet Union and Communism | Soviet Union and Communism | 2015-08-14 |
| 21 | Land Combat | Land combat mechanics | 2015-08-21 |
| 22 | Support Companies | List of support companies | 2015-08-28 |
| 23 | Industrial Capacity | How factories function | 2015-09-04 |
| 24 | Trade and Resources | Overview of international trading | 2015-09-11 |
| 25 | Laws and Politics | How to manage government | 2015-09-18 |
| 26 | The Navy | Naval doctrines and naval technology | 2015-09-25 |
| 27 | Italy | Italy's situation in the game | 2015-10-02 |
| 28 | Weather & Terrain | How weather and terrain function | 2015-10-09 |
| 29 | Factions & Wargoals | How factions and wargoals function | 2015-10-16 |
| 30 | France | Overview of France | 2015-10-23 |
| 31 | Peace Conferences | Ending wars | 2015-10-30 |
| 32 | The USA | Overview of USA | 2015-11-06 |
| 33 | Supply | The supply system and supply areas. | 2015-11-13 |
| 34 | Civil Wars | Civil Wars and Coups. | 2015-11-20 |
| 35 | Germany | Overview of Germany | 2015-11-27 |
| 36 | Helping out in other wars | Helping out in other countries wars without directly getting involved | 2015-12-04 |
| 37 | Carrier Warfare | How aircraft carriers work. | 2015-12-11 |
| 38 | Submarines | How submarines work | 2015-12-18 |
| 39 | The Radio | Radios, reinforce chance and radar stations. | 2016-01-08 |
| 40 | Changes to the game | Completely revised factory slots mechanic, World Tension.. | 2016-01-15 |
| 41 | Order of Command | OOC and Commander traits | 2016-01-22 |
| 42 | Japan | Overview of Japan | 2016-01-29 |
| 43 | Diplomacy and other options | Diplomacy, Factions, War Goals, ... also: HOI4 is now in BETA | 2016-02-05 |
| 44 | Occupation and Resistance | Managing occupied territory | 2016-02-12 |
| 45 | Battle Plans | How battle plans work | 2016-02-19 |
| 46 | United Kingdom | Overview of UK | 2016-02-26 |
| 47 | China | Overview of China | 2016-03-04 |
| 48 | Naval Invasions | How naval invasions work | 2016-03-11 |
| 49 | Nukes! | Atomic bomb - Research and requirements for production and use | 2016-03-18 |
| 50 | Generic Focus Trees | Generic Focus trees and DDR mat support | 2016-04-01 |
| 51 | Sound & Music | Music & Sound Design in Hearts of Iron IV | 2016-04-08 |
| 52 | Modding | A look at the improved modding support in Hearts of Iron IV | 2016-04-15 |
| 53 | 2D art | Sideburnout talks about the 2D graphics of Hearts of Iron IV | 2016-04-22 |
| 54 | AI | SteelVolt speaks of the topic no one wants to touch, but everyone wants to know about | 2016-04-29 |
| 55 | QA | A closer look into the QA process when developing Hearts of Iron IV | 2016-05-06 |
| 56 | Bits & Pieces | Mopping up a bunch of smaller topics not covered in other Development Diaries | 2016-05-13 |
| 57 | Poland: United and Ready | About the free DLC shipped with all copies of Hearts of Iron IV | 2016-05-20 |
| 58 | Tutorial, Wiki & Browser | A look at the tools we provide to help you learn how to play Hearts of Iron IV | 2016-05-27 |
| 59 | D-day | A short, final message from Podcat before we release | 2016-06-03 |
- Patch 1.1 (Red Ball Express)
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 60 | Release and Future | Podcat shares his thoughts on the release, as well as discussing the near future patches | 2016-06-10 |
| 61 | Red Ball Express | Tweaks to access to allied territory, peace conferences, invasions and naval bombers along with new battle plan modes upcoming in 'Red Ball Express' | 2016-06-17 |
| 62 | Summer Vacation | The team is going on a well deserved summer vacation | 2016-07-01 |
- Patch 1.2 (Sunflower)
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 63 | Back from Vacation | AI changes and MP hotjoin in 1.2, aka 'Sunflower' | 2016-08-05 |
| 64 | Custom Difficulty Settings | AI improvements and implantation of custom difficulty settings at game setup | 2016-08-12 |
| 65 | Sunflower (patch 1.2) | Port Strikes and AI improvements to upgrading templates and naval missions coming in Sunflower | 2016-08-19 |
| 66 | New Releasable Nations | A look at new releaseable nations and more of the AI improvements coming in Sunflower (patch 1.2) | 2016-08-26 |
| 67 | Sunflower Improvements | Sunflower updates: GUI improvements, naval balance, focus trees | 2016-09-02 |
| 68 | Bugs and Stats | Readying Sunflower for release and sharing some gameplay stats | 2016-09-09 |
| 69 | Sunflower is Live | Patch 1.2 is out live, next patch is 1.3 aka "Torch" | 2016-09-16 |
Videos
Developer video diaries and developer's let's play sessions on the various expansions.
- Videos
| No. | Title and Link | Description | Date |
|---|---|---|---|
| 1 | Hearts of Iron 4 Live streams | Earlier previews of Hearts of Iron IV by the devs mixed with Q&A | 2014-08-18 |
| 2 | Hearts of Iron 4 #1 - Grand Ambitions | Johan Andersson, Dan Lind, Mats Virtanen, and Jakob Munthe discuss the design and ambitions of the fourth installment of the Hearts of Iron series. | 2016-03-15 |
| 3 | Hearts of Iron 4 #2 - Naval, Land and Air Power | Johan Andersson, Dan Lind, Mats Virtanen, and Jakob Munthe discuss the different types of warfare and how they're used in Hearts of Iron IV. | 2016-05-12 |
| 4 | Hearts of Iron IV - Beginner Tutorial | Jake (aka DDRJake) hammers HoI4 beginner tutorials in a soothing, calming voice | 2016-05-30 |
| 5 | Hearts of Iron 4 #3 - Politics and Coups | Johan Andersson, Dan Lind, Mats Virtanen, and Jakob Munthe discuss on the political interactions in Hearts of Iron IV. | 2016-06-01 |
| 6 | PDX FanGathering 2016 | A sneak MP peak at the new HoI4 Together for Victory expansion at the 2016 PDX FanGathering | 2016-12-02 |
| 7 | Together for Victory - Feature Spotlight | Dan "Podcat" Lind speaks on the upcoming Together for Victory country pack and patch 1.3 | 2016-12-07 |
| 8 | Death or Dishonor - Release Trailer | Release trailer detailing the features of the Death or Dishonor DLC for Hearts of Iron 4. | 2017-06-14 |
| 9 | Tutorial #1 - Interface Overview | An in-depth interface tutorial with Daniel "Da9L" Sjöberg and Christian Daflos (community manager). | 2017-10-25 |
| 10 | Tutorial #2 - Trade, Production, Division Templates | The 2nd part of the tutorial this time covering trade, production, and division templates. With Daniel "Da9L" Sjöberg and Christian Daflos (community manager). | 2017-11-01 |
| 12 | Waking the Tiger #1 - China | Dan "Podcat" Lind and Gabriel Blum with details on the expanded representation of the Chinese fronts. | 2018-01-30 |
| 13 | Waking the Tiger #2 - Germany & Decisions | Dan "Podcat" Lind and Drikus Kuiper with details on alt-historic path in the German focus tree, the new decision system, as well as new mechanics around stability and war support. | 2018-02-01 |
| 14 | Waking the Tiger #3 - Chain of Command | Dan "Podcat" Lind and Kandra Dahlgren with details on the new Chain of Command mechanic and commander traits, the new command power mechanic and division namelists/insignias. | 2018-02-07 |
| 15 | Hearts of Iron IV - Patch 1.5 "Cornflakes" | Dan "Podcat" Lind expands on the free 1.5 patch (aka Cornflakes) accompanying the Waking the Tiger expansion. | 2018-02-09 |
| 16 | PDXCon 2018 - News From The Front | Dan Lind, Game Director of Hearts of Iron IV, discusses the future of HOI and its upcoming update Man the Guns. | 2018-05-20 |
- Let's Plays
| No. | Title and Link | Description | Start date | End date |
|---|---|---|---|---|
| 1 | World War Wednesday | Daniel Sjöberg (replacing Jakob Munthe as Nazi Germany) faces off against Johan Andersson (as Jolly England) in the war of the century, testing out the ins and outs of Hearts of Iron IV | 2015-12-02 | 2016-03-10 |
| 2 | World War Wednesday - Pre-release | Jake and Daniel showcasing single player campaigns and co-op nations | 2016-03-17 | 2016-06-23 |
| 3 | The Three Day War | Multiplayer event of HoI4 where devs and youtubers vying for dominance | 2016-06-14 | 2016-06-16 |
| 4 | Together for Victory - Launch Dev MP | Together for Victory feature stream by Dan and Daniel | 2016-12-08 | 2016-12-14 |
| 5 | Death or Dishonor | Daniel "Da9L" Sjöberg and Dan "Podcat" Lind taking a sneak peak at the upcoming HoI4 Country Pack | 2017-04-26 | 2017-06-15 |
| 6 | Chain of Command | Multiplayer event of HoI4 where devs and youtubers vying for dominance | 2017-08-16 |
