Hearts of Iron IV: A Beginner's Guide (2026)

What Is Hearts of Iron IV

Hearts of Iron IV is a global strategy game from Paradox Interactive set during World War II. You control any country in the world starting in 1936 (or 1939): develop industry, conduct diplomacy, research technologies, and command armies, navies, and air forces on the scale of entire fronts. The game is renowned for its depth and mods, and victory here depends not on click-based tactics but on planning: whoever has better prepared their economy and division templates wins the war even before it begins.

Choosing a Country for Your First Game

Don’t choose small countries like Hungary or Brazil for your first game—it’s hard to learn the game without an industrial base. And don’t be afraid to set the recruitment difficulty: everyone’s first games end in surrender.

Basic Mechanics: Political Power and Factories

The two main resources are political power (PP) and factories. PP accumulates daily and is spent on ministers, laws, and decisions—don’t sit on a surplus of 500+; invest it right away. Factories are divided into civilian (construction and trade) and military (equipment production). The golden rule of the economy:

• 1936–1938: Build civilian factories so you can build faster later.
• 1938–1939: Switch to military factories—war is coming.
• Improve infrastructure only in regions with resources and for future construction.

National Focuses and Research

The Focus Tree — the country’s strategic roadmap: politics, industry, military. Each focus takes 70 days — plan your path in advance and don’t interrupt focuses unnecessarily. Research: keep all slots filled at all times. Newcomer priorities: industry (building and resource extraction speed), infantry weapons, support (sappers, artillery, reconnaissance), then doctrines for your chosen path. Only take advanced research with a time penalty in critical branches.

Army: Division Templates

A division template is the heart of land warfare. Basics:

• Front width—battles take place at a width of 70/80, so create formations with a width of 20 or 40 (for example, 9 infantry + 1 artillery = 21).
• Support companies—sappers, artillery, reconnaissance, field hospital, and logistics—provide huge bonuses for next to nothing.
• Defensive infantry (cheap, wide) holds the front, while assault divisions (tanks + motorized infantry) break through.
• Spend your army’s experience on editing templates, not on modifying equipment at the start.

War: Planning and Encirclements

Before the war, map out the front and lines of advance: generals receive a planning bonus. The main tactic in HoI4 is encirclement: don’t press forward head-on along the entire line; instead, break through the front with armor at two points, close the encirclement, and destroy the cut-off divisions. Keep an eye on supplies: troops without supplies lose discipline and speed—advance from railroads and ports, and improve logistics. Airpower is key: fighters provide air superiority, while close air support (CAS) aircraft grind down enemy infantry in combat.

Common beginner mistakes

• Head-on attacks without air superiority or supplies—discipline breaks down, and the front line doesn’t advance.
• Formations that are too wide (45+ in width)—they can’t engage in combat and don’t receive bonuses.
• Ignoring the navy and convoys—without them, there are no landings or trade.
• Stalled production queues: switch models, but don’t let factories sit idle.

Conclusion

Hearts of Iron IV is a game where the first playthrough teaches you economics, the second teaches you unit formations, the third teaches you encirclement, and the hundredth earns you achievements for small nations. Start with Germany or the USSR, plan two years ahead, control the skies—and the world map will be painted in your colors.