Square eggs
In some levels there are little wooden boxes on the ground (some leveles are "shifting sand land" "snowman's land" and some other courses) As Yoshi go into one of those courses and find the little box. Make Yoshi eat the box. When Yoshi eats enemies, the eggs he makes are round, but when he eats the little box he makes a square egg and when you shoot it at enemies it makes more coins!
More tricks, tips and cheats for this game are right here - Super Mario 64 DS cheats
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