Has anyone actually ever beaten Metal Gear for the NES (without the use of a FAQ)? I've spent about 6 hours just trying to find the last keycard. It would be a shame to give up and look at a FAQ now since I've struggled my way this far, but I am near the edge of my patience. Wish me luck.

UPDATE: So I finally gave in and looked at a FAQ. I probably spent about 8 hours on a wild goose chase due to some dialogue that was a relic of the MSX version of the game (see Wiki for differences between MSX and NES versions). Furthermore, the only way to finish the game was to get through a maze area; unfortunately, nowhere in the game are directions for that area provided. These revelations will definitely hurt the game's score when I review it.