Super Mario Bros.

Unlockable: Extra Lives - First Ghost House
In the first ghost house, fly up to the upper left corner. You will see a ledge. Run to the right and you will fall. Ghosts will try to hurt you but keep on going. At the end of the ledge you will fall and there will be four extra guys. You will have to hit the boxes to get them. Go though the door. There will be a Moon (3 lives.) After you beat it there will be a level above the ghost house. Go to it. In it there is five boxes. The two left ones contain, flowers. The two right ones contain feathers. The middle one has Yoshi. If you already have Yoshi then it will be an extra life. To exit, run off the screen.