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The Worms Ultimate Mayhem “Multi-player Pack” features 5 fantastic new multi-player maps for use ...

NOTICE: This content requires the base game Worms Ultimate Mayhem on Steam in order to play.

The Worms Ultimate Mayhem “Multi-player Pack” features 5 fantastic new multi-player maps for use across the numerous multi-player modes. The “Multi-player Pack” also includes 6 brand new achievements.

Windows MINIMUM:

OS: Windows 7 / Vista / XP
Processor: 3.0 GHz P4, Dual Core 2.0 (or higher) or AMD64X2 (or higher)
Memory: 2GB
Graphics: 512 MB NVIDIA GeForce 8400 / ATI Radeon HD 4650 or higher
DirectX®: 9.0c
Hard Drive: At least 1.8 GB of Space
Sound: DirectX 9.0c compatible
Other: Internet connection required

To activate the Steam key you've received, follow the instructions below;

First up, open the Steam client. (If you don't have it, simply click the "Install Steam" button here => Steam Store )
Sign in to your Steam account. (If you don't have one, click here to create a new one => Steam Account)
Click on the "ADD A GAME" button in the bottom corner of the client.
Then, select "Activate a product on Steam..."
Write down or copy-paste the activation key that you've received from %s in the window.
Your game is now visible in your library! Click on your "Library".
And finally, click on the game and select "Install" to start your download.