you can read this in the valve bio page :
what did valve cancel ?
Greg Coomer - Product Design / Communications
Prior to joining Valve, Greg helped Microsoft design various software products. Before that, he worked with Nintendo, started and ran a user interface design company, and spent several years as a freelance product designer. Greg helped to name the company "Valve", and then led the first game project that Valve ever cancelled. His secret dream is to create a game called ’Akzidenz-Grotesk’. You know, for kids.
what did valve cancel ?