PSP's Metal Gear Solid: Peace Walker was Metal Gear Solid 5

[Euphoria14]

Doobie_wop said:
So is Metal Gear: Rising linked to the PSP one then? I still don't get how Snake goes into the 5th one if he quit in MGS4?

The same way they had MGS3 when it wasn't the same Snake from MGS and MGS2.

Peace Walker probably has you playing as Big Boss again. It shows a young Snake so it no doubt from the past.