The first game Splash Damage ever officially contributed to: Return to Castle Wolfenstein, is 10 years old! RtCW, published by Activision, was released to the North American market on November 19th, 2001.
As a small treat from Splash Damage they uploaded a picture of a whiteboard with their original map design plans for one of their own map creations: The Damned. It will provide some small measure of insight into a map designers process, albeit 10 years old!
Microsoft Windows: NA - November 19, 2001 / EU: November 30, 2001
Linux: March 16, 2002
Mac: OS X April, 2002