Steam key.

Plz rate UP my achievement guide http://steamcommunity.com/sharedfiles/filedetails/?id=821480448
You need other Counter Strike Source achievements? Join our group http://steamcommunity.com/groups/CWFAG - events every Friday!

Also (if U can) rate'n'fav in the last days of greenlight game Deep Space Anomaly - it's like a well-modernized mix of Star Control and Missile Command:
http://steamcommunity.com/sharedfiles/filedetails/?id=935182031