A few more games have joined the growing list of backwards compatible titles on Xbox One.
Xbox 360 versions of Portal 2 and Left 4 Dead are backwards compatible, as well as Ubisoft's Flashback remake.
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The sequel to Left 4 Dead was one of the first games to join the service, but this is the first time the original has been available.
Slightly lower profile releases include Brain Challenge and Babel Rising - the latter of which can't be bought from the Xbox 360 store.
The full list of compatible games is growing by the week, and includes the Gears of War series, Fallout 3, Fable 2 and 3, a couple of Halo games, Dark Souls and Assassin's Creed 2.
More recently, games like Comix Zone, Altered Beast, Ron Gilbert's The Cave, Double Dragon Neon, Jet Set Radio and Ghostbusters: Sanctum of Slime joined the service.
Upcoming backwards compatible games include the BioShock trilogy and Skate 3.
Microsoft also confirmed that multi-disc games would now be available on Xbox One, starting with Deus Ex: Human Revolution - Director's Cut.
A recent update also lets you buy backwards compatible games direct from the Xbox One store, but only if they were released digitally.
