There's A Gun in the Office Game Keys

Go to: http://store.steampowered.com/ and download STEAM client
Click "Install Steam" (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don't have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam...
Follow the onscreen instructions to complete the process.
After successful code verification go to the "LIBRARY" tab and start downloading.

Imagine being trapped, kidnapped, and racing against the clock to escape. Locked in a room with nothing to protect you or even eat. You’re faced with a terrifying challenge: your captors return every day, so every action you take must be perfectly discreet. Each time you leave your room, you must leave everything exactly as you found it - or risk everything. You have five days - Monday through Friday - to uncover your escape route. If you fail, you won’t survive. Every decision counts. Can you outsmart your captors and escape in time, or will you be trapped forever? Time is ticking.