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Key Features:

• 193 real countries all playable & equipped with realistic data drawn from the CIA World Factbook, the United Nations and U.S. Military databases.
• Sophisticated A.I. designed to realistically simulate each country.
• Real-life combat situations, with multiple forces joining and leaving battles as the balance of power shifts.
• Real-time gameplay and Modular units building.
• Solo scenarios and "sandbox mode", as well as full Multiplayer support for up to 32 players in a variety of styles, including world domination, economic master, and many others

SuperPower 2 Steam Edition Features:

• 14 steam achievements
• New internet matchmaking library, and modified the UI flow in the multiplayer menus
• Updated the code to support new OS
• Widescreen Resolution support
• Editor and Full SDK included

Gameplay Changes:

• Capital ships needed for invasions from the sea. They need to be within 750km of the region you're trying to invade.
• Enemy fleets must be further than 1500km of your invasion fleet when trying to invade a region from the sea.
• The AI will take diplomatic relations into account and will decide whether or not to annex regions under it's military control now.
• Economy: GTM limited to 30%, sectortax at 70%.
• Diplomacy: embargo treaties result in a drop in relations.
• Combat Radius has been enlarged to make frontlines easier to make.
• AI: allies will make more rational decisions when there is war. If you can handle it yourself, they won't help.
• Peaceful Annexation: depending on population support in both nations, you now have more or less chance of peacefully annexation a nation.
• 95 and the nations involved need at least one religion or language in common.