PC - Windows Cheats: Command And Conquer: Red Alert 2 Cheats

Invincible Demolition Trucks
Build five or six Demolition Trucks and have a fully charged Iron Curtain ready. Drive the Demolition Trucks into an enemy base and engage the Iron Curtain on them before enemy weapons can hit them. The Demolition Trucks will not explode until they reach the target.

Trojan bus
When playing as the Soviets, use a Yuri to mind control a school bus. Load five infantry units into the bus and drive it inside an enemy base. The Allies will not fire on the bus.