唤醒勇虎 是钢铁雄心4的第一个成熟的扩展包。 它于2017年11月15日宣布，并于2018年3月8日发布，与1.5版本更新同步发售。
自1.14.3版本（2024-3-21）起，唤醒勇虎扩展包被整合进了基础游戏，不再作为单独分销品来提供。[1]
扩展功能
- 中国新国策树:在你对未来的憧憬指引下领导中共或中华民国赢得战争。
- 修改了德国和日本的国策树:两个轴心国现在有了不同的历史走向，包括推翻希特勒或在日本建立共产主义或民主。
- 将军特质和能力:将军的特质现在可以解锁强大的指挥能力，允许极大的灵活性和创造力。
- 决策和任务:历史决策和国家任务为政治点数的使用提供了新的场所，从国内政治开始的特殊项目。
- 增加了发送志愿军到其他国家的能力，让你看到他们的军队，以及基于国家军事经验，和接收国少量的组织和计划速度。
- 更多:从战场上缴获装备，使用志愿航空队，以及新的音乐和美术。
- 增加了一种中国军阀独有的新货币:政治支持点。作为军阀积累足够的政治支持点来夺取控制中国的命运。
Free features
- 主条目：Patch 1.5
- New Stability and War Support mechanics replace National Unity to better model the state of your nation and many decisions and changes to go with these
- New focus tree for Japan
- Overhauled and expanded German focus tree: added new focuses for the Industrial, Air, Naval, and Fascist paths, and improved certain existing ones.
- Added Chain of Command * Can now put Field Marshals in charge of Generals leading armies to get bonuses from both
- Generals now have 4 skill values * Attack, Defense, Planning, Logistics instead of a single skill.
- Traits are no longer lost on promotion of commanders
- Commanders can (and usualy do) start with new personality traits
- Added Decisions * a middle ground between focus trees and events allowing tons of moddability and mechanics
- Added many Decisions to go with the new Decisions mechanic.
- Added Acclimatization core mechanic letting troops get used to harsh climate
- Can now dedicate some Command Power to improve air efficiency in a zone using Extra Ground Crews ability
- Added "kick from faction" diplomatic action (for SPAAAAARTA!!! /Podcat am I 2011 meme:ing again?)
- New historical template namelists. Increased immersion when meeting AI and a lot of power to letting player control how things get named
- New retreat mechanic. We now separate between withdrawing and forced retreat meaning you dont get overruna nd crushed when ordering retreat on units and falling back wil lrequire a lot less microing
- New interface for looking at lost and sunk ships
- Massively improved production interface with more filters, collapsing, drag and drop and allowing more than 15 factories to be assigned to a single line
- New War overview with factions, filters, sorting. It also has a summarized war overview which we recommend. Wars are now much more fluid to be able to handle 3-way wars and avoid lots of issues in the past with war merging etc.
- Several new Refinery techs allow you to control how much rubber and oil is outputted
- Infrastructure now effect how much resources can be extracted. Build up an area to unlock more, bomb it to hurt output
- Special forces are now limited to a % of your army, or a minimum count of battalions
- Several new techs allow you to bonus special forces or control quantity vs quality
- Can now attach air wings to armies and they will follow them and do missions
Developer diaries
All developer diaries about the Waking the Tiger expansion and patch 1.5 (aka 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 |
| 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 |