From Valve Developer Community

Information

Codename: Gordon is a wacky Jump 'n Run Game inspired by Half-Life 2 and created using Flash for the game-engine and Photoshop for the graphics.

It features 6 chapters, 8 different enemies, 5 weapons and a full-fledged buggy.

The game also includes a highscore system with network support and a bunch of funny secrets.

NOTE: Codename: Gordon has been discontinued from Steam, as the developer, Nuclear Vision, Has gone bankrupt. their former website is coded into the game itself, and said website has been repossesed.