First Strike contains 5 incredibly diverse maps spanning the globe; featuring 4 new multiplayer maps and a new Zombie experience. “Berlin Wall” features combat on both sides of the imposing wall; "Discovery" is a desolate, frozen German outpost in Antarctica; in "Kowloon", battle in the rain along the rooftops of a towering Chinese sprawl; "Stadium" is an intense locale with a pro hockey arena backdrop; and in "Ascension", fight zombies in a Soviet launch facility.

Requires the full version of Call of Duty: Black Ops to play.

Call of Duty®: Black Ops Download Minimum System Requirements:

• OS: Windows Vista / XP / 7
• Processor: Intel Core 2 Duo E6600 or AMD Phenom X3 8750 or better
• Memory: 2GB
• HDD: 12GB**
• Video: Shader 3.0 or better 256MB NVIDIA GeForce 8600GT / ATI Radeon X1950Pro or better
• Sound: DirectX 9.0c-compatible
• DirectX: 9.0c
• This game requires internet connection and a free registered Steam account

**Call of Duty®: Black Ops requires an initial hard drive space of approximately 24GB to download and install the game via digital download (8GB of compressed files, 8GB of decompressed files and 8GB of installed files). Upon installing the game, 16GB (compressed and decompressed files) may be deleted from the hard drive. Please make note of where the compressed and decompressed files are being saved on your hard drive in order to later locate these temporary files for removal.