For one thing, I can tell that's definitley not the Metal Gear on NES. There's way too much detail on the background and Snake's sprite for it to be on NES. I'm not sure, but I think that's the MSX version, which almost no one has played due to it never being released in North America. So I doubt most people would be able to solve this one.
Oh, and while searching for a picture of the MSX version, I found the same picture. You put one of the floor tiles on the top left of the screen and got rid of the shadows on the right-most box and right wall.
No, that the MSX version, all right! That one is definitley better than the crappy NES version!
By the way, yes, you're right, sorry about the tile on the top left, but you're missing one more thing in the picture. One clue is that something doesn't match with the others! Look closely and you'll find out! Once you find out which one has the difference, tell us what it is, and then you'll get your prize! :wink: