Command & Conquer: Red Alert 3 – Decimation Map Pack

is DLC for the Xbox 360 version of Command & Conquer: Red Alert 3 includes 6 skirmish/multiplayer maps:

Deep End (originally an EA Store exclusive on the PC)
Dreadnaught Alley (originally an EB Games and GameStop exclusive on the PC)
Neon Crisis (originally a pre-order exclusive on the PC)
Repair Bay (originally a Premier Edition exclusive on the PC)
Pier Pressure (originally a GAME exclusive on the PC)
Wrong Steppe (originally a Best Buy exclusive on the PC)