This game was very cool back in the NES days. Good graphics and great control. You can use rations to revive your energy, smoke cigarettes to detect lasers, hide in boxes, sneak under cameras so you won't be seen, and various other types of options. Although I personally have never finished the game, I did get very far into it. If you want to play the better versions, check out Metal Gear Solid for the PSX and for the people who just can't get enough of it, try MGS VR Missions for the PSX. Metal Gear: Sons of Liberty will be out for PS2 soon also.
