Full list of Xbox games developed by Valve

Game Score Ratio Gamers Comp % Comp Time Rating
Left 4 Dead Left 4 Dead 3,002 (1,500) 2.00 239,430 2.3 40-50 hours
4.2
Left 4 Dead 2 Left 4 Dead 2 2,944 (1,500) 1.96 240,377 2.9 20-25 hours
4.2
Portal 2 Portal 2 1,806 (1,000) 1.81 176,106 7.8 15-20 hours
4.6
Portal: Still Alive Portal: Still Alive 327 (200) 1.63 59,374 19.4 6-8 hours
4.5
The Orange Box The Orange Box 2,543 (1,000) 2.54 185,768 1.5 80-100 hours
4.3