CheatCodes.com has all the official NBA Jam '99 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 Wednesday June 19, 2013 for NBA Jam '99 are shown below. We also have this game on Nintendo64, Game Boy, and sometimes tricks from other game systems will also work on Game Boy.
Select "Playoffs" from the main menu and enter "MIK" as initials. Then, enter "R4QKFCWCDG" as a password.
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)!