Speaking this week, veteran game maker has revealed that the PSP's Metal Gear Solid: Peace Walker could have arrived as 5.

Apparently, if the game wasn't being created for Sony's handheld, then it could have been regarded as a numbered iteration in the series - rather than a separate project.

"Since it is on PSP, I did not officially number it. But [with] the game design, story, number of staff and budget-you can say that this is a big project. It would've been number 5," Kojima lets slip.

"It's not a side story or a spin-off. It's not like Portable Ops or Acid."

Thanks TGL.

By Luke Guttridge