Five more Xbox 360 games have been released for Xbox One’s backward compatible program, and there is a pair of them that you should pay considerable attention to.

First up is Portal 2, Valve and EA’s long-awaited sequel to the hit puzzle/action game. This time around, you’re once again facing off against GLADoS as you take on a number of diabolical challenges. The game has an ample co-op campaign as well, if you want to bring a friend along.

Left 4 Dead from Valve is also available, following the release of Left 4 Dead 2 a while back. It features plenty of zombie-shooting action, along with a robust multiplayer mode for those that want to get their kicks in.

In addition, Flashback, Brain Challenge and Babel Rising are also available through the store – though Babel is only available if you previously purchased the game, as it’s no longer offered in the store. Download away!

Be sure to also check out this Portal 2 Space Core mod for Skyrimand the PS3 version of Portal 2 supporting the PlayStation Move controller