Metal Gear Solid Master Collection Volume 2 revives Peace Walker, but lets other PSP-era games like Portable Ops fade away: "This game should be considered an integral part of the saga"

Cover art for Metal Gear Solid: Portable Ops.

Metal Gear Solid Master Collection Volume 2 was revealed at yesterday's Sony State of Play presentation, confirming that Metal Gear Solid 4 is finally being freed from its long-standing PS3 jail. The collection also includes the 2000 Game Boy Color game Ghost Babel and the 2010 PSP title Peace Walker, but there are plenty more Metal Gear entries not present here – including Portable Ops.

Portable Ops, released in 2006 for PSP, is something of a black sheep in the series. It's set after Metal Gear Solid 3, telling the story of how Big Boss first built the military unit that he'd lead in Peace Walker and MGS5. It'd make perfect sense for inclusion in Volume 2, since it bridges the gap between MGS3 in the previous collection and Peace Walker here.