Super Mario World
Contributed by-Richard

Strange Mario walk:
Quickly hold L + R + X + Y + Up when the Princess is freed in the
final level. Mario will walk strangely during the ending credits. 

Hint: Maximum lives:
Find Yoshi and place a power-up that is not already in use in the item
box. Enter a previously completed course and find a berry that is
positioned just above Yoshi's mouth. Press Select to drop the power-up
from the item box. Have Yoshi jump so that he eats the berry and the
power-up at the same time. The game will freeze and the coin total
will increase rapidly. Press Start + Select to exit the level after
accumulating ninety-nine lives. 

Uphill Yoshi slide:
Face toward a slope and press Down and L or R to slide upward.

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Contributed by-pheabco1@webtv.net 

Yoshi's girlfriend: L, L, L, R, R, R, X, Y, B, A
Yoshi slides up a hill: up, l, r