Here are the Yoshi Story codes
Black Yoshi
Go to the #4 Torrential Maze on Page 2. When you start, keep heading
upward through several rooms until you get to a room that has ghost
vines coming from the ceiling that you can barely see from the ground.
Jump from vine to vine, if you're fast enough, you'll come to an edge
with a floating bubble. Pop the bubble and grab the large egg that looks
like a soccer-ball. Finish the level as usual by collecting fruit. When
you turn to the next page, a black yoshi will be with the other six.
This Yoshi likes to eat everything, and he gets three hearts for eating
any fruit or shy-guy. His eggs also make a larger explosion than the
regular ones.
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Rotate Pop-Up Pages
To get a better look at the stage select pop-up displays, you can turn
them slightly with the C-Buttons and zoom in and out with R and Z.
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White Yoshi
On Page 3 Area 3 starting from Miss Warp 3 go right. When the road
splits with a vase at each end, go in the upper vase. Then go right and
enter the upper vase. You should see a dog and a red/orange pipe south
of you. Go right and go into the first red/orange pipe to enter a hidden
cave. Go right and throw an egg at the bubble. You will now receive a
large white egg. Eat the remaining fruit on the level and on the next
page and you will be able to choose the White Yoshi.
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Pop Bubbles Without Eggs
Want to pop a bubble but don't have any eggs? Here's how to do it:
Simply keep bumping/jumping on it (beware of pits) and eventually it
will pop.
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Hidden Mario Paint Tune
Go to the Trial Mode menu in Yoshi's Story and wait. Let the music play
through a total of eight times -- when the loudest xylophone-ey sound
disappears then reappears, it has played through once. After eight
times, the music will stop and be replaced by a tune from Mario Paint,
then resume.