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Portal 2 and Left 4 Dead receive Xbox One backwards compatibility | Eurogamer.net
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/cdn.vox-cdn.com/uploads/chorus_image/image/61823309/940x528_3_hero_1.0.png "Xbox One X enhancements added for The Orange Box, Left 4 Dead - Polygon")
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Xbox One and Series X/S backward compatibility games list
Half-Life 2, Portal, Left 4 Dead 1 & 2 Enhanced On Xbox One X - Game Informer
Left 4 Dead, Portal 2 added to Xbox One backwards compatibility | VG247
