The Sarcastic Raptor
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.
Link to the Mod : https://www.moddb.com/mods/contra/downloads/contra-009-final
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If you want to get some numbers on secondary economy, here's cost and income:
Black Market: Costs 2500, gives 600 credits per minute
Supply drop zone: costs 2500, gives 750 credits per minute, this is increased to 825 per minute with Supply Lines.
Hacker: costs 675, gives 150 credits per minute, this is doubled to 300 credits when they're fully ranked.
The Hackers specifically have this about them: four hackers cost as much as a single supply drop zone and brings in 600 credits per minute, doubled to 1200 per minute when ranked.
What you want to do is spam hackers and have them sit on the ground spread out around your base hacking money. That way you get two extra hackers per internet center you don't build, and having them spread out make them a less likely target for support power like air strikes.
If you want a more chill game you can make a 2v2 with an AI ally, that way you'll have someone acting like a buffert zone to slow down the enemy.
HAHAHA AI trolled you!