Super Mariio Wonder Infinite 1UP W2 best

Choose a character other than Yoshi Totten.
Enter course W2 "Merry Condor is Flying".
Proceed to the midway point.
Make a staircase of blocks a little further from the midway point.
Place the red shell on the side so that it is in the center of the block (press UP+Y to throw it or DOWN+Y to place it)
Jump on top of the shell and you will continuously step on it for an infinite 1-up.
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