How to get a CD Key for free
1 - First step is to register as the member
2 - Go to the "Earn Coins" page
3 - Choose an offer and complete it with valid information
4 - After completion your coins will be automatically awarded to your account and you can get the Half-Life 2: Deathmatch CD Key
About This Game
Fast multiplayer action set in the Half-Life 2 universe! HL2s physics adds a new dimension to deathmatch play. Play straight deathmatch or try Combine vs. Resistance teamplay. Toss a toilet at your friend today!
Source: Half-Life 2: Deathmatch - SteamPowered.com
Instructions to activate steam keys
1 - Download and install the Steam client on your PC.
2 - Open the Steam client, login and locate the Games tab on the top menu. Click this and then select “Activate a Product on Steam…”
3 - Enter your activation key that appears on the email and follow the instructions to activate it.
4 - Your game is now viewable in the “Library” tab and is available to download/install when you’re ready