Contra is a freeware modification for Command and Conquer Generals: Zero Hour real-time strategy game. It's a big project started in 2004. It adds many new units as well as numerous new upgrades, new general's powers and buildings. It also adds new sounds, maps, bug fixes, enhanced graphics, and other effects, as well as three new generals.
This is the map intro of a new challenger, USA Boss, who will be available in later versions of Contra. Also, an FPS Control button was added to all Challenge maps. Each click changes the game speed in real time. You may have seen this button in older versions, but this time it works!