Goomba (emulator)
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Goomba, named after an iconic enemy in the Mario series is a freely available Game Boy emulator for the Game Boy Advance, developed by Fredrik Olsson (FluBBA). When the project was first started, the only reason for development was for the sheer fun of it, even though the GBA could already play GB games natively. However, the emulator has had a boost in speed optimizations and features since the Nintendo DS and Game Boy Micro were released, neither of which contain compatibility with old games.
Development of the original Goomba seems to be ceased, however since the source code is available in the public domain, an unofficial version has been forked with Game Boy Color support, named Goomba Color, by Dan Weiss (Dwedit). While most games play with great compatibility, some heavy programs slow down in Goomba Color, and changing color palettes in the middle of a frame rendering is not supported (some GBC games use this trick to simulate "high-color" modes).