Polish developers Reality Pump have released a playable demo of World War III: Black Gold, available for download from likewise Polish site Gry-Online. World War III: Black Gold is a 3D real-time strategy game and the sequel to Earth 2150 and The Moon Project, and this English demo weighs in at a hefty 130.8 MB, allowing you to play a tutorial and a single-player mission on the USA side in the game, and there's also a skirmish mode. Update: A US-based mirror of the demo is now available at 3D Gamers.