Left 4 Dead and Portal 2 join the Xbox One backwards compatibility list [Update: Three more games]

Xbox One gamers can get their hands on two more backwards compatible games, this time with Valve titles Left 4 Dead and Portal 2. Both games will be available to play via backwards compatibility starting today.

Most gamers are probably familiar with the two classic titles from Valve. However, if you've missed out thus far, Left 4 Dead is a first person shooter that pits players against hordes of the undead as you travel through each level. Portal 2, meanwhile, is a puzzle-platforming game through which you use a portal gun to bend the laws of physics to get around.

If you're interested, you can check out the full list of backwards compatible titles.

Update: Three more Xbox 360 games have been added to the Xbox One backwards compatibility list. One is Flashback, the sci-fi platformer from Ubisoft, and another is Microsoft's own Brain Challenge. The final game is Babel Rising, which is not available for download from the Xbox Store.