1. Go to http://www.dwedit.org/gba/goombacolor.php and download Goomba Color and the builder application
2. Use the builder tool to add your GBC game into the output *.gba compilation
3. Compile the game and copy the output *.gba file to your card.
If the latest version has issues, try the next older version, as I've heard this one actually has some speed issues the older one didn't have for certain games (though it increased speed with other games).
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