Great game.....gets too much credit though..
When Metal Gear 2: Solid Snake invented most of the things this game was renowned for:
*Running up a spiral of stairs with guards chasing you
*Warming and cooling a key and having t obacktrack in the process
*Getting a call from a guy claiming to be "One of your fans"
*A fist fight
*A fight with a Hind D
*Knocking on walls to lure guards
*Meeting up with a woman dressed like a soldier in the ladies bathroom
*Frozen rations
*Escaping with a woman at the end
*Crawling through a vent to enter the main building
*4 guards attacking you in a elevator
MGS is great game, but Metal Gear 2: Solid Snake is better.