Mario's Time Machine (NES)/Door 2

1687
Head over to the second door and go inside. Just like the first door, you will have to destroy all the Koopas. The last one will drop an Apple. Pick up the Apple and enter the Timulator. This time go to 1687 and at the very right there is a big tree and that is where you put the Apple. Make sure you are standing on top of the tree when you are using the Apple and not on the bottom since it will not work and a bird will come and take it away. Another Newspaper will come up with another big thank you.

1989
Mario will be in front of the second door. Go through it once again and defeat the Koopas. The last Koopa will leave behind a Sledge Hammer. Pick up the Sledge Hammer and travel back to 1989. When you are in 1989 go to the building labeled GUARDS that is all the way over to the right and put the Sledge Hammer in front of the Guards door. Yet, another newspaper will appear thanking you for returning the yet to be artifact. (It is yet to be used. Read below.)

Mario will appear in front of the second door again and will cover it up with bricks just like he did with the first door.