CheatCodes.com has all the official Dr. Mario 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 May 22, 2013 for Dr. Mario are shown below.
Play virus levels 5, 10, or 15 at medium or high speeds. Wait at the intermission screen that features three viruses in a tree. A bonus object will appear at the top of the screen. A different object will appear depending on which level and speed is currently being played. After completing level 20 on medium or high speed, an object will fly above the little viruses on the tree.
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)!