Kojima made it very clear from day 1 that the Xbox 360 could not handle the MGS4 engine. When it was announced at E3 that the MGS franchise would be coming to the Microsoft platform I wondered if Kojima had made progress in making the MGS4 engine compatible with the Xbox 360, but that appears to be untrue. During the latest Kojima podcast, Sean Eyestone stated that Kojima has reworked the “engine from scratch” to make MGS: Rising compatible with all three major platforms.

Kojima podcast via GamerCenterOnline