The Entertainment Software Rating Board (ESRB) rated Metal Gear Solid: VR Missions for PlayStation 3, PlayStation Vita and PlayStation Portable, according to a listing on the ratings board's website.

Metal Gear Solid: VR Missions was released in North America as a standalone product for the PSOne in 1999 and in Japan as part of Metal Gear Solid: Integral. The North American black disc included a vastly expanded set of virtual reality training missions like those found in Metal Gear Solid, which was released the previous year.

Metal Gear Solid: VR Missions came to PS3 earlier this month as part of the Metal Gear Solid: The Legacy Collection bundle, which was released July 9 on the PlayStation Network for $49.99. The ESRB listing, which was spotted by NeoGAF user ULTROS!, and its platforms suggest a PSOne Classics release for the game.

We've reached out to Konami for information about the standalone listing and will update this story with more information as we receive it.