What do Undead Knights, Naruto Shippuden: Legends: Akatsuki Rising, NBA 2K10, Star Wars: The Clone Wars: Republic Heroes and Cars: Race O Rama have in common? All of these are PSP games released on UMD after the PSP Go's October 1 launch -- and all are currently without a digital equivalent. Owners of the Go system are unable to play these games because they simply aren't available on the PlayStation Store.