Glitch/Cheat: Infinite Lives
Start by getting to world 1-2, at the point where you enter the pipe at the
beginning of the level. You will come to wall, so climb up it. There will be a
turtle and a power up block. On the ground there will be two purple blocks that
you'll need to smash through with a butt stomp. There will be another turtle down
there, but what you want to do is stomp on him without hitting the shell.
Afterwards you want to walk off from the left onto the shell, and if you do it
right it will break the blocks and bounce back and fourth giving you as many lives
as you want. You can repeat as desired.