Valve Project Tracker Might Show Half-Life 3, Left 4 Dead 3, and MoreValve Project Tracker Might Show Half-Life 3, Left 4 Dead 3, and MoreValve might have finally learned how to count to three! Leaked project tracker shows date files that hint at Half-Life 3, Left 4 Dead 3, Source 2, and others.John Llewellyn MartinJohn Llewellyn Martin