The "Collie" patch focused on improving accessibility and expanding the game's map without requiring a purchase:
: Added a special infantry model with a Pickelhaube for Unaligned Germany. Hearts of Iron IV: Battle for the Bosporus Free...
The was the free patch released alongside the Battle for the Bosporus country pack for Hearts of Iron IV . While the main expansion adds paid focus trees for Turkey, Greece, and Bulgaria, the free update provides significant refinements to existing Balkan content and general gameplay. Key Free Features of Update 1.10 ("Collie") The "Collie" patch focused on improving accessibility and
: New in-game tutorial videos were added to help new players navigate the game's steep learning curve. These are accessible via alerts at the top of the screen. Key Free Features of Update 1
: Received a reworked focus tree for Yugoslavia and tweaks to Romania's starting position.