: Jump straight up and land on the shell. If your timing and position are correct, Mario will repeatedly bounce on the shell without touching the ground.
: Each bounce initially gives points, but eventually, you will start earning a 1-Up with every "bop". NES Cheats - Super Mario Guide - IGN Super Mario Bros Cheats Nes Infinite Lives
: At the very end of World 3-1, right before the flagpole, there is a stone staircase with two Koopa Troopas descending. : Jump straight up and land on the shell
This is the most iconic secret in the game. It allows you to rack up dozens of 1-Ups in a single level by repeatedly bouncing on a Koopa Troopa shell. NES Cheats - Super Mario Guide - IGN
: You can get here quickly by using the Warp Zone at the end of World 1-2.
In the original for the NES, "infinite" lives aren't a menu option but an exploit built into the game's mechanics. The most famous method is the World 3-1 Turtle Trick , though you can also use Game Genie codes if you have the hardware or an emulator. The World 3-1 Turtle Trick (Turtle Tipping)
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