Infinite 1-Ups in World 2-4
This is probably the easiest and fastest way to get infinite 1-Ups. First, just go through World 2-4 as you normally would, and stop when you get to the staircase at the very end of the level. Stand on the first (bottom) step of the stairs, and wait for the Koopa to come. As soon as the Koopa lands on the second step, jump. If this is timed right, you will keep bouncing on the shell and start getting 1-Ups. If you mess up, just walk to the left a good distance and when you come back to the staircase the Koopa will be back.
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