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.
Cybernetic general is constantly being balanced. It's a thin line between being OP or a very weak general. New structure is called Spider Nest. This structure is small, cheap and easy to build. It is stealth all the time. Attacks nearby enemy units by releasing small Spider Mines. It is great when you need to stop Dragon tank, or any rush unit while you still don't have TOW missiles upgrade.