Instructions
Start the game and hit the first "?" block to get a Super Mushroom and become Super Mario. Keep moving to the right. Avoid Goombas and other obstacles until you finish the level.
Move to the end of the second level but do not enter the green warp pipe. Jump on the rising platforms and let them carry you to the top of the screen. Jump from here to the right and run along the bricks until three more warp pipes appear. Go down the one labeled with a "3."
Move to the end of level 3-1. There will be a staircase with two Koopa Troopas descending. Jump over the first one and position yourself on a stair beneath the second one.
Jump straight up when the second Koopa Troopa is one step above you. Mario should come down in such a way that he lands on the turtle's head and knocks him into his shell.
Press the "A" button repeatedly and as fast as you can, as soon as Mario lands on the Koopa Troopa. If done correctly, Mario will begin to bounce up and down on the turtle shell. After a few bounces, each subsequent bounce will result in an extra life. Continue pressing "A" and hopping on the turtle shell until you get 100 lives.