Command & Conquer: Red Alert/Mission 6: Infiltrate and destroy Iron Curtain research center

Variant A
Allies, Mission 06a (upper route)

"Infiltrate and destroy Iron Curtain research center"

Briefing: "Priority One is to establish a base and get your spy into one of the Soviet tech centers in the base across the gulf. Data on the Iron Curtain is in there and we need it. Once you get the data complete your mission... wipe out everything."

For Mission 6, in which you need to infiltrate Soviet research center near Aegean Sea (funny that Greece here is all covered in snow) you have two different choices which route you can take. They have same objective but the map layout is different. You'll get this map from choosing the upper arrow. This one seems a little bit harder, but they are comparable in difficulty.

Walkthrough: First you need to fend off incoming Soviet attacks. Then you need to produce three transports full of Medium Tanks to wipe out Soviet base. You can use Gunboats to destroy some Soviet Power Plants to shut down their power (afterwards you don't need to worry about Tesla Coils).

Variant B
Allies, Mission 06b (lower route)

"Infiltrate and destroy Iron Curtain research center"

Briefing: "Priority One is to establish a base and get your spy into one of the Soviet tech centers in the base across the gulf. Data on the Iron Curtain is in there and we need it. Once you get the data complete your mission... wipe out everything."

For Mission 6, in which you need to infiltrate Soviet research center near Aegean Sea (funny that Greece here is all covered in snow) you have two different choices which route you can take. They have same objective but the map layout is different. You'll get this map from choosing the lower arrow. This one seems a little bit easier, but they are comparable in difficulty.

Walkthrough: First you need to fend off incoming Soviet attacks and establish your base. Then you need to produce three transports full of Medium Tanks to wipe out Soviet base. You can use Gunboats to destroy some Soviet Power Plants to shut down their power (afterwards you don't need to worry about Tesla Coils).