Command and Conquer: Red Alert 2 Cheats

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.

First you have to be Soviet, Build all the way to a battle lab and build that to.
Now build Cloning Vats and wall off the barracks all around tightly against the side.
Now you get free men*. Next build as many men as you want (since they are free) and send them back into the Cloning Vats*. There , Free Money!
*#1: You have to have enough money to buy it, and then you get your money back, and a clone comes out of the Vats!
*#2: Except For: Crazy Ivan, Crono Ivan, Chrono Commando, Engineer, rocketeer, Tanya And Yuri Prime.
NOTE:Any unit that teleports takes several tries to go in, so continuely press the button.

To get a Uri Prime, have a Russian battle lab, and then dump a spy into another Russian battle lab. You'll get a Uri Prime. They rock, because of their massive range etc.
Plus, if you have cloning vats, you can get two (!)
[The game only usually allow you to train one]

Create four or five well-spaced power plants right off
the bat in Skirmish or multiplayer games to bring up
your power bar on the right-hand side of the screen,
and then keep your eye on it. Be sure to garrison your troops into civilian buildings
for extra cover while fighting the enemy; when the building
starts to break down due to firepower, send in an engineer
to repair it. Speaking of engineers...not only can they repair broken
bridges or partially destroyed buildings, but they can
also penetrate an enemy base and convert their structures. Create many "Tanyas" (Allied), or "Crazy Ivans" and "Yuris"
(Soviet) in multiplayer games. They're the most versatile
and skilled infantry units available for their respective sides. Although it's expensive, build an Ore Purifier to help
squeeze more credits out of your mining expeditions.

This hint will make any attack with the ALLIES 100% effective.

(1) Build x amount of dogs.
(2) Build half amount of soldiers (any type except Rocketeers)
(3) Build the same amount of tanks as soldiers. (any type)

Now set 2 dogs to guard a soldier and each soldier to guard a tank. Send the tanks to attack a base and they will be completely guarded. If someone attacks a soldier, the dog will tear him to bits, and if an attack on a tank is made, soldiers will take care of the problem.