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, buildings and new generals. It also adds new music and sounds, maps, bug fixes, enhanced graphics, and other effects, as well as three new Generals. There are tons of people playing in multiplayer. You can start a game at any time.
When Contra 007 was released, it had new multiplayer maps. But they were locked because of an error. This fix unlocks 5 new maps. Install: Unpack it and put ini file into "Generals Zero Hour/Maps" folder.