Metal Gear Solid: Peace Walker, the action role-playing- and real-time-strategy hybrid released in 2010 for PSP and 2011 as part of the HD Collection, is now available on PSN. In addition to art from Yoji Shinkawa and a variety of chatty (and singing) mech enemies for Snake to overcome, Peace Walker also features four-player co-op missions and a three-on-three versus mode, playable over wireless via Ad Hoc.
As a side note, Transfarring, the means by which owners of both a PS3 and PSP could swap saves between systems, is not supported in the PSN download.
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Official Site: MetalGearSolid.com
