All cheats for this game by platform:
GameBoy
Downloadable Yoshi Cheats
Primary Collection of Cheats
Extra points
Place a bottom half shell on the bottom of the entire
platform. Build a group of blocks on it until you reach the top.
Then wait for a top half of a shell to appear. Drop the top half
on the stack and it will turn in to a full grown Yoshi and you
will receive more points than usual.