The most notable of the additions are truly old-school: Phantasy Star 2 and Sonic & Knuckles, both Xbox Live Arcade games now playable on Xbox One.
Throwback Thursday indeed Several Xbox 360 games have been made backward compatible on Xbox One today, according to Microsoft.
Sega originally released both games on Sega Genesis; Phantasy Star 2 came stateside in 1990, while Sonic & Knuckles launched worldwide in 1994, months after Sonic the Hedgehog 3.
Other 360 games now playable on Xbox One include Dig Dug, Runner 2 and Samurai Shodown 2.