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Minerva's Den offers a brand-new, self-contained BioShock story, presenting a side of Rapture you've never seen before. Seek out the tools you'll need to unlock new goals and spaces in the order you choose.

BioShock 2 : Minerva's Den

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.