Hearts of Iron IV: Battle for the Bosporus

About

This expansion for Hearts of Iron IV adds dedicated national focus trees to the minor powers around the Black Sea and the Aegean. Bulgaria, Greece and Turkey can each chart unique historical and alternate history paths as they resist efforts by the major powers to dominate the strategic sealanes of the Bosporus and Dardanelles.

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5
Based on
1119 reviews
Country Compatibility:
Languages:
Developer:
Paradox Development Studio
Publisher:
Paradox Interactive
Release date:
15 October 2020
Recent Steam reviews:
Not specified
All Steam reviews:
Mixed (1119)

Game features

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Description

This expansion for Hearts of Iron IV adds dedicated national focus trees to the minor powers around the Black Sea and the Aegean. Bulgaria, Greece and Turkey can each chart unique historical and alternate history paths as they resist efforts by the major powers to dominate the strategic sealanes of the Bosporus and Dardanelles.

Features of Hearts of Iron IV: Battle for the Bosporus include:

  • National Focus Tree for Bulgaria: Balance the factions in a divided land or reclaim territory lost in 1919. Follow the historical alliance with Germany or resist the German pressures on Tsar Boris, standing up for a free Bulgaria.
  • National Focus Tree for Greece: Riven by political division, Greek neutrality is maintained by the controversial Metaxas. Build a strong relationship with the Allies under the guidance of King George II, follow arch-conservatives into fascism or restore the glories of Greek Empire in the east.
  • National Focus Tree for Turkey: Robbed of its empire in the last war, what future is there for Turkey in a new one? Continue or halt the reforms of Kemalism, stand as the protector of the Balkans in a new regional faction, restore the Sultan to the throne or found a new Islamic state.
  • New Music Tracks
  • New 3D Unit Models for Balkan and Turkish Armies
  • Unique voiceovers for Bulgaria, Greece and Turkey

Recommended system requirements

minimum*

OS *:
Windows 7 64-bit or newer
Processor:
Intel Core 2 Quad Q9400 @ 2.66 GHz / AMD Athlon II X4 650 @ 3.20 GHz
Memory:
4 GB RAM
Graphics:
ATI Radeon HD 5850 / NVIDIA GeForce GTX470 (1GB VRAM)
DirectX:
Version 9.0
Storage:
2 GB available space
Sound Card:
Direct X- compatible soundcard
Additional Notes:
Mouse and keyboard are required. / Latest available WHQL drivers from both manufacturers/ Internet Connection or LAN for multiplayer, Up to 32 other players in multiplayer mode.

recommended*

OS *:
Windows 7 64-bit or newer
Processor:
Intel Core i5 750 @ 2.66 GHz / AMD Phenom II X4 955 @ 3.20 GHz
Memory:
4 GB RAM
Graphics:
ATI Radeon HD 6950 / NVIDIA GeForce GTX570 (2GB VRAM)
DirectX:
Version 9.0
Storage:
2 GB available space
Sound Card:
Direct X- compatible soundcard
Additional Notes:
Mouse and keyboard are required. / Latest available WHQL drivers from both manufacturers/ Internet Connection or LAN for multiplayer, Up to 32 other players in multiplayer mode.

User reviews

Dogmeat General
Not recommended | 08 Dec 2025

Bulgaria tree is okay. Turkish tree is a little confusing. Greek tree is worse than testicular torsion.

Helpful: 21
PolarBear9412
Not recommended | 03 Jan 2026

Turkey is the worst country in this DLC. The Kurdish Rebels are extremely annoying and hard to stop and the focus tree is very boring. Greece I actually don't mind too much, it just feels like it's missing something.

Helpful: 6
Asura Deva
Recommended | 09 Mar 2026

Battle for the Bosporus adds focused content for Turkey, Bulgaria, and Greece, including new national focus trees and historical events. It improves gameplay in the region with more strategic options, political

Helpful: 5
Minci
Not recommended | 26 Jan 2026

This is one of the best games of its genre. So why the bad review? Paradox is milking this old game and thumbs down will stay until HOI5. Most of the DLCs they offer add features which should have been in the game from

Helpful: 1
Azoubel
Recommended | 09 Feb 2026

The Turkish focus tree is much too big—so big that you never finish the focus. Greece is fine and Bulgaria too. I would give it a 5 out of 10 because these nations are kinda irrelevant in game and I usually don't play

Helpful: 2
LordL
Recommended | 20 Mar 2026

As a long-time hoi4 player, I can say that this expansion is absolutely worth it on three conditions; 1- You enjoy a more difficult playstyle. Greece and Turkey are quite weak historically speaking, and that's reflected

Helpful: 1