Hearts of Iron III: Their Finest Hour by Paradox Interactive

Along with the enhanced gameplay there are two new battle scenarios and a new custom game mode that lets you jump straight into the action.

• New unique, elite units for each major nation's army - Ghurkhas, Rangers, Imperial guards, and more
• A deeper naval invasion system with the ability to develop specialized landing and assault crafts
• Increased control over strategic warfare with a new lend-lease system for lending your industrial might to allies
• Leaders are now able to gain traits and allocating them is more important than ever with a new combat tactics system
• New game mode for single and multiplayer. Start with a clean slate and instantly produce units, research technologies, and affect political alignment. Speed up the early years and jump straight into the action.
• Two new detailed battle scenarios: Finnish Winter War and the Spanish Civil War