小島プロダクション
When people questioned why some games were not included in the HD or Legacy Collection Kojima Productions, Sean Eyestone shed some light on some of the reasons titles like The Twin Snakes and Portable Ops were excluded: "That was a remake made by Silicon Knights. We supervised it but we didn't create it directly and we wanted to make sure that everything in the HD Collection was canon. Everything that goes into there is something created directly by Kojima Productions and Kojima himself. So that is the reason why Twin Snakes was not included in HD Collection." Metal Gear Rising: Revengeance was later excluded from the Metal Gear Solid: The Legacy Collection for similar reasons.