'Halo: Reach' runs poorly on the Xbox One

The Xbox One's backwards compatibility has a problem with one of the 360's best-known games.

The Xbox One's backwards compatibility with Xbox 360 games has largely worked as promised, but there's now one glaring exception. Microsoft has confirmed reports that Halo: Reach (aka one of the 360's biggest titles) runs much slower than you'd expect. While talk of it being "unplayable" is extreme, Bungie's shooter fell from a largely steady 30 frames per second on the original hardware to the mid-teens -- enough to throw you off during intense action scenes. Others report audio glitches, too.

Microsoft says it's working on a fix, but it's not certain when that will arrive or how well it'll work. Either way, the debacle illustrates the challenge of emulating highly customized console hardware: even if you largely get it right, there are bound to be a few games that slip through the cracks. It's no wonder that Sony is being cautious with its own compatibility plans.