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.
Another map for six players. Team players' starting positions are very close to each other, so they can mix their bases easily.
Tech structures: 10 Oil Derricks, 4 Artillery Platforms, 2 Repair Bays and 1 Radar.