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Then, perform the exploit on the Gamecube to launch an unsigned application named 'boot.dol' from the memory card. Just fire up GCMM (GameCube Memory Manager) on the Wii's Homebrew Channel and flash one of the exploits to your memory card. However, there are a number of exploits available for common games, including Wind Waker, Twilight Princess and Smash Bros, among others, which allow you to launch homebrew on an unmodified console, and these are easy to utilize if you have a softmodded Wii. There is homebrew-known as Game Boy Interface (GBI)-that can replace the functionality of the launcher disc, but most of the ways to launch the homebrew are fairly costly ($30-50), require hardware modifications to the console itself and/or require a launcher disc of their own that can get scratched/damaged/lost and then you're SOL again. However, you can buy the hardware without the disc for substantially less (more like $25 at the time of this writing), since it's thought to be useless on its own. The Game Boy Player add-on for Nintendo's Gamecube console requires a special launcher disc (Game Boy Player Start-up Disc) to function, normally, and it costs a fair bit (somewhere around $75 at the time of this writing) to get a complete package including the hardware and software disc.
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I recently bought a Game Boy Player without the start-up disc and went through this process with frustratingly little guidance available online, so I figured I'd lay it all out to save anyone else the pain and hassle:
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