CheatCodes.com has all the official Yoshi Game Boy cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Saturday May 18, 2013 for Yoshi are shown below.
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.
Found some tricks that we don't have? Got some helpful hints, tips, or tactics we don't know about? Tell us and you could win a free Game Boy game (or any other game you want for any video game system)!