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By Blood Alone
No Step Back
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.
All developer diaries about the By Blood Alone expansion and patch 1.12 (aka Avalanche).
Patch 1.12 (Avalanche)
No.
Title and Link
Description
Date
18
Post-Release
Post-Release graphs and feedback
2022-10-12
17
Release!
Release of the By Blood Alone expansion and patch 1.12
2022-09-27
16
Art & Achievements
New art and achievements for By Blood Alone
2022-09-21
15
Tech
Updated OS requirements and performance improvements of Avalanche
2022-09-14
14
Modding
Overhauled Career Profile with Playthrough Overviews and (moddable!) in-game Awards
2022-08-31
13
Quality of Life Improvements
Changes to war support, piercing, AI tank strategy, and more
2022-08-24
12
Peace Conference Roundup
Overview of the new peace conference system, including UI and new demand types
2022-08-17
11
Division Commanders & Unit Medals
New field officers and awardable medals for divisions.
2022-08-10
10
Plane Designer
A look at the new plane designer.
2022-08-03
9
Ethiopia #2
A look at the alternate history branches of the new Ethiopian focus tree.
2022-07-20
8
Switzerland #2
A look at the alternate history branches of the new Swiss focus tree.
2022-07-12
7
Italy #2
A look at the alternate history branches of the updated Italian focus tree.
2022-07-05
6
Ethiopia #1
A look at the common and historical branches of the new Ethiopian focus tree.
2022-06-29
5
Switzerland #1
A look at the historical branch of the new Swiss focus tree.
2022-06-22
4
Italy #1
A look at the common and historical branches of the updated Italian focus tree.
2022-06-15
3
Designer Corner: Naval Rebalance
Goals and implementation plans for naval rebalance.
2022-06-01
2
Designer Corner: Air Changes
Open discussion for changes to Air management and combat.
2022-05-18
1
Designer Corner: Peace Conference
Open discussion for changes to peace conferences.
2022-05-04
All developer diaries about the No Step Back expansion and patch 1.11 (aka Barbarossa).
Patch 1.11 post release
Patch 1.11 (Barbarossa)
All developer diaries about the Battle for the Bosporus country pack and patch 1.10 (aka Collie).
Patch 1.10 post release
No.
Title and Link
Description
Date
9
5th Anniversary
Hearts of Iron IV 5th Anniversary and patch
2021-06-02
8
New year update
Statistics after Battle for the Bosporus, general view on 2021.
2021-01-20
7
Telemetry
Short description of Telemetry of how player behaviour changed since the DLC release
2020-10-21
Patch 1.10 (Collie)
No.
Title and Link
Description
Date
6
1.10 ‘Collie’
Full changelog
2020-10-14
5
Art and Achievements
New art, music, and achievements.
2020-10-07
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
3
Turkey
Description of Turkish focus tree and briefly talking about pathways.
2020-09-23
2
Bulgaria
Description of Bulgarian focus tree and briefly talking about pathways.
2020-09-16
1
Greece
Description of Greek focus tree and briefly talking about pathways.
2020-09-09
All developer diaries about the La Résistance expansion and patch 1.9 (aka Husky).
Patch 1.9 post release
Patch 1.9 (Husky)
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 1.8 (Fork)
Patch 1.7 (Hydra)
Patch 1.6 post release
No.
Title and Link
Description
Date
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
36
1.6.2 Update
1.6.2 Highlights and patchlog
2019-03-27
35
1.6.2 Open Beta Patch
1.6.2 open beta patch content and AI naval screen statistics
2019-03-20
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
33
MTG Post Release
Small telemetry information and what's planned for the patch.
2019-03-06
Patch 1.6 (Ironclad)
No.
Title and Link
Description
Date
32
1.6 Patchlog
Full 1.6 "Ironclad" patch log and Reddit AMA highlights.
2019-02-27
31
Man the Guns MEGA RECAP
Recap of everything that has been announced.
2019-02-20
30
AI Plans
More AI strategy plans, and the integration of AI strategy into the Custom Game Rules menu.
2019-02-13
29
Achievements
New goals to strive for, with the addition of 21 new achievements related to MTG.
2019-02-06
28
The Imperial Japanese Navy
An AAR of Archangel85's experience with the Imperial Japanese Navy in a MP session.
2019-01-30
27
Art and Music
New music, 3D models and 2D art to ramp up MTG's awesomeness.
2019-01-23
26
Tech Changes
Changes to the tech research system and the addition of new naval techs.
2019-01-16
25
Fuel Review and Motorized Artillery
Changes to the fuel implementation and the addition of motorized artillery units
2019-01-09
24
Subs and Convoy Raiding
Improvements to submarine convoy raiding
2018-12-12
23
New Naval Combat
Rework of naval combat to be more informative and less decisive
2018-12-06
22
Bag of Tricks #3
Dutch & British focus changes, ideology drift tweaks, map changes in Africa and the Balkans region.
2018-11-28
20
Naval Treaties and Ship Refits
Naval treaties effects on ship designing and refitting of obsolete ships
2018-11-14
19
Ship Designer
Overview on modifications on the ship designer system.
2018-11-07
18
Bag of Tricks 2
Expeditionary Force Requests, Supervised States & On-map decisions.
2018-10-31
17
Mexico focus tree
Announcement of and information about the new Mexican focus tree.
2018-10-24
16
Naval changes #1
Overview of the different changes to naval warfare.
2018-10-17
15
Naval Terrain
Overview of new terrain types for seas.
2018-10-10
14
Amphibious Vehicles and Research
New Amphibious Tractors and Amphibious Tank.
2018-10-03
13
Je Maintiendrai
Announcement of and information about the new Dutch focus tree.
2018-09-26
12
Exiled Government
Extend possibilities for exiled governments and more information about the British focus tree overhaul.
2018-09-19
21
Naval Rework #1
New mission types and changes to the naval interface
2018-11-21
11
Naval Production, Repair and Damage
Extensive changes to the naval theater with reworks of ship production, repair and damage.
2018-09-12
10
Modding and Traits
Added trait system for admirals as well as more features for modders.
2018-09-05
9
USA focus tree rework
Reworked USA focus tree, allowing for alternate-history paths.
2018-08-29
8
Mines and Minesweeping
Naval Mines added to the game along with minesweeping.
2018-08-22
7
Naval Access
Improvements to the naval theater of HOI4 including marking dangerous seazones and asking for naval access to ports.
2018-08-15
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
5
Custom Gameplay Rules
New Custom Gameplay Rules allowing the player to steer the game in the direction they want.
2018-08-01
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
3
God Save The King: British Focus Tree Rework
Reworked British focus tree, allowing for alternate-history paths.
2018-07-04
2
Fuel
Information on fuel and new hotfix.
2018-06-27
1
Man the Guns and PdxCon
General goals for the future expansion and patch
2018-05-23
All developer diaries about the Waking the Tiger expansion and patch 1.5 (aka Cornflakes).
Patch 1.5 post release
Patch 1.5 (Cornflakes)
No.
Title and Link
Description
Date
29
Pre-Release and International Women's Day
Women's contribution during the second world war.
2018-03-07
28
Recap Episode
What is coming in Waking the Tiger and the 1.5 Cornflakes.
2018-02-28
27
Performance and AI
Performance and AI.
2018-02-21
26
Formable Nations and Achievements
New goals to strive for: formable nations and some 18 achievements.
2018-02-14
25
Naval Updates
Improvements of naval matters: losses and kills overview, convoys raiding, transports interception, and more.
2018-02-07
24
Sound, Music and Art for Tiger
On the topic of the artistic additions to Waking the Tiger .
2018-01-31
23
War Changes and game Difficulty
Changes to 3-way war handling and addition of 2 more difficulty settings.
2018-01-24
22
Manchukuo
The last unrevealed focus tree for Waking the Tiger: "Manchukuo".
2018-01-17
21
Bag of Tricks #3
3rd assortment of small improvements: attachés, extra ground crews, historical army insignias, and volunteer air wings.
2018-01-10
20
Japan rework
A rework of the Japanese national focus tree.
2018-01-03
19
New German Divisional Namelist
Further improvement of incoming German unit namelist.
2017-12-27
18
Christmas & Modding
Modding guide for the new decisions & missions system in patch 1.5.
2017-12-20
17
Border Wars: The Last Warlord
More detail on the Chinese warlords.
2017-12-13
16
Acclimatization and Special Forces
Troops are now affected by hot and cold climates, and new changes to special forces.
2017-12-06
15
Leaders, abilities and Traits
Revamped and expanded trait system and the mysterious "red phone" icon (aka command power ).
2017-11-29
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
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
12
Decisive Action
Adding decisions, missions, crises and special projects to the game
2017-11-08
11
Airplanes and Lootboxes
Further improvement of air related aspects
2017-11-01
10
Bag of Tricks #2
Another small features and improvements, this time with relation to equipment
2017-10-25
9
A New Germany
Revised focus tree for Germany as part of requested alternate history options
2017-10-18
8
Bag of Tricks #1
Smaller improvements to the game: control groups, divisions consolidation, removal from faction, mini-map & pinging.
2017-10-11
7
Synthetic Dawn
Refinements to synthetic refineries and inter-linking infrastructure with resources
2017-10-04
6
Division Namelists
Pallidum, HoI4's game designer, inserting some flavor (and logic) to division names.
2017-09-27
5
Stability and War Support
Stability and War support to replace National unity in the next patch
2017-09-20
4
Chain of Command
Podcat on spicing things up in the HoI4 chain of command as part of patch 1.5
2017-09-13
3
A Product Manager's Role
"Firebolt", HoI4's product manager, on the intricacies of budgeting a game development.
2017-09-06
2
Our development process
Sofia "KimchiViking" Höglund, HoI4's project lead, explains the development cycle, from design to implementation.
2017-08-30
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
All developer diaries about the Death or Dishonor country pack and patch 1.4 (aka Oak).
Patch 1.4 post release
No.
Title and Link
Description
Date
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
12
Meet some new people
Beta patch status, preliminary gaming statistics post DoD and introduction of new team members
2017-06-28
11
Post-release chat
Bugs, new and old, dealt with in the 1.4.1 beta patch.
2017-06-21
Patch 1.4 (Oak)
All developer diaries about the Together for Victory country pack and patch 1.3 (aka Torch).
Patch 1.3 post release
Patch 1.3 (Torch)
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 1.2 (Sunflower)
No.
Title and Link
Description
Date
69
Sunflower is Live
Patch 1.2 is out live, next patch is 1.3 aka "Torch"
2016-09-16
68
Bugs and Stats
Readying Sunflower for release and sharing some gameplay stats
2016-09-09
67
Sunflower Improvements
Sunflower updates: GUI improvements, naval balance, focus trees
2016-09-02
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
65
Sunflower (patch 1.2)
Port Strikes and AI improvements to upgrading templates and naval missions coming in Sunflower
2016-08-19
64
Custom Difficulty Settings
AI improvements and implantation of custom difficulty settings at game setup
2016-08-12
63
Back from Vacation
AI changes and MP hotjoin in 1.2, aka 'Sunflower'
2016-08-05
Patch 1.1 (Red Ball Express)
No.
Title and Link
Description
Date
62
Summer Vacation
The team is going on a well deserved summer vacation
2016-07-01
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
60
Release and Future
Podcat shares his thoughts on the release, as well as discussing the near future patches
2016-06-10
Patch 1.0
No.
Title and Link
Description
Date
59
D-day
A short, final message from Podcat before we release
2016-06-03
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
57
Poland: United and Ready
About the free DLC shipped with all copies of Hearts of Iron IV
2016-05-20
56
Bits & Pieces
Mopping up a bunch of smaller topics not covered in other Development Diaries
2016-05-13
55
QA
A closer look into the QA process when developing Hearts of Iron IV
2016-05-06
54
AI
SteelVolt speaks of the topic no one wants to touch, but everyone wants to know about
2016-04-29
53
2D art
Sideburnout talks about the 2D graphics of Hearts of Iron IV
2016-04-22
52
Modding
A look at the improved modding support in Hearts of Iron IV
2016-04-15
51
Sound & Music
Music & Sound Design in Hearts of Iron IV
2016-04-08
50
Generic Focus Trees
Generic Focus trees and DDR mat support
2016-04-01
49
Nukes!
Atomic bomb - Research and requirements for production and use
2016-03-18
48
Naval Invasions
How naval invasions work
2016-03-11
47
China
Overview of China
2016-03-04
46
United Kingdom
Overview of UK
2016-02-26
45
Battle Plans
How battle plans work
2016-02-19
44
Occupation and Resistance
Managing occupied territory
2016-02-12
43
Diplomacy and other options
Diplomacy, Factions, War Goals, ... also: HOI4 is now in BETA
2016-02-05
42
Japan
Overview of Japan
2016-01-29
41
Order of Command
OOC and Commander traits
2016-01-22
40
Changes to the game
Completely revised factory slots mechanic, World Tension..
2016-01-15
39
The Radio
Radios, reinforce chance and radar stations
2016-01-08
38
Submarines
How submarines work
2015-12-18
37
Carrier Warfare
How aircraft carriers work
2015-12-11
36
Helping out in other wars
Helping out in other countries wars without directly getting involved
2015-12-04
35
Germany
Overview of Germany
2015-11-27
34
Civil Wars
Civil wars and coups
2015-11-20
33
Supply
The supply system and supply areas
2015-11-13
32
The USA
Overview of USA
2015-11-06
31
Peace Conferences
Ending wars
2015-10-30
30
France
Overview of France
2015-10-23
29
Factions & Wargoals
How factions and wargoals function
2015-10-16
28
Weather & Terrain
How weather and terrain function
2015-10-09
27
Italy
Italy's situation in the game
2015-10-02
26
The Navy
Naval doctrines and naval technology
2015-09-25
25
Laws and Politics
How to manage government
2015-09-18
24
Trade and Resources
Overview of international trading
2015-09-11
23
Industrial Capacity
How factories function
2015-09-04
22
Support Companies
List of support companies
2015-08-28
21
Land Combat
Land combat mechanics
2015-08-21
20
Soviet Union and Communism
Soviet Union and communism
2015-08-14
19
Equipment
How equipment works
2015-07-03
18
Army Planner
Creating and deploying units
2015-06-26
17
Johan Invades Germany
Barely a dev diary
2015-06-12
16
World Tension
World tension, war justifications
2015-05-08
15
On the high seas
Naval battles
2015-04-11
14
National Focuses
National focuses
2015-03-20
13
Conscription & Training
Manpower, recruitment, training
2015-02-20
12
Internal Politics
Internal affairs of a country
2015-01-16
11
Map & Graphics
Visual aesthetics of the game
2014-11-07
10
Naval Combat
Naval gameplay
2014-10-10
9
Vacation and Air tech
Air technology tree
2014-09-12
8
Experience and Variants
Production
2014-08-08
7
Air Combat
Air war
2014-07-11
6
Division Design
Division planner, division template
2014-06-13
5
Production Lines
How things get built
2014-05-09
4
Land Doctrines
Doctrine paths
2014-04-11
3
Bringing WWII to the mainstream
Dogs!
2014-04-01
2
The Tools of War
Equipment, production and research
2014-03-07
1
Our Vision
Design goals
2014-02-07
Developer video diaries and developer's let's play sessions on the various expansions.
Videos
No.
Title and Link
Description
Date
17
Hearts of Iron IV: No Step Back - Soviet Focus Tree
.....
2021-11-02
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
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
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
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
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
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
9
Tutorial #1 - Interface Overview
An in-depth interface tutorial with Daniel "Da9L" Sjöberg and Christian Daflos (community manager).
2017-10-25
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
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
6
PDX FanGathering 2016
A sneak MP peak at the new HoI4 Together for Victory expansion at the 2016 PDX FanGathering
2016-12-02
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
4
Hearts of Iron IV - Beginner Tutorial
Jake (aka DDRJake) hammers HoI4 beginner tutorials in a soothing, calming voice
2016-05-30
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
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
1
Hearts of Iron 4 Live streams
Earlier previews of Hearts of Iron IV by the devs mixed with Q&A
2014-08-18
Let's Plays
No.
Title and Link
Description
Start date
End date
6
Chain of Command
Multiplayer event of HoI4 where devs and youtubers vying for dominance
2017-08-16
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
4
Together for Victory - Launch Dev MP
Together for Victory feature stream by Dan and Daniel
2016-12-08
2016-12-14
3
The Three Day War
Multiplayer event of HoI4 where devs and youtubers vying for dominance
2016-06-14
2016-06-16
2
World War Wednesday - Pre-release
Jake and Daniel showcasing single player campaigns and co-op nations
2016-03-17
2016-06-23
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