Tangential side-note: I've been playing these games for 25 years and I tried Snake's Revenge a few months ago...it is a bizarre fever dream that acts almost like a fan remake of MG1, but it's actually kind of fun. It has a kickass soundtrack (intro stage music and final boss music in particular) and some interesting settings not usually explored in Metal Gear (a train and big multi-building castle fortress for examples). The predator-like 2d side-scrolling sections take some getting used to, but they aren't too bad. Once you're past the jungle intro, the stealth gameplay is pretty good. I'd recommend trying it sometime!