https://wccftech.com/four-valve-xbox-360-games-xb1x/

Microsoft announced yesterday that all the four Xbox 360 games released by Valve on Microsoft’s last generation console have now been enhanced for the Xbox One X hardware. The titles are, of course, Half-Life 2: The Orange Box, Left 4 Dead 1 and 2, and Portal: Still Alive.

Starting today, four new Xbox 360 titles will be available enhanced for Xbox One X: the historic collection of Half-Life 2: The Orange Box, Portal: Still Alive, Left 4 Dead, and Left 4 Dead 2. Whether players are revisiting these iconic titles by Valve or experiencing them for the first time, they’ll see them with the stunning visuals only the Xbox One X can deliver.