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GAH, gamespot shouldn't be calling that a stage demo, thats an interview spliced with trailer footage!
Do you not know what the deal is with ground zeroes and the phantom pain? MGS:GZ was a small prologue to the phantom pain, meant mostly to serve as an early sampling of some of the mechanics/ gmaeplay in phantom pain. MGS:TPP is said to be like, 400x the size of Ground Zeroes...I aint paying $40+ again for 2 hrs of gameplay.