In my opinion, this one sits right under 2. Acting as a prequel to metal gear solid 1 & 2 you get to go back to see where it all began and man is it just amazing. The HD version is just an updated version of subsistence, which if you don't know added a dynamic camera angle and allowed you to switch between fixed and fluid with the press of a button. It really adds to the experience. The story in this is less convoluted (for a metal gear game) and will blow you away if you aren't familiar. Konami, please don't fuck up the remake, I beg of thee.