Well first you go to options an see data scroll down and explore good luck
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Geno does not exist in SSBB. It is possible to texture hack to make a character look like Geno, but Geno is not a real character in SSBB.
There is a method to load custom SSBB hacks off your SD card through the stage builder. I'm not entirely familiar with the process, however you can find more information here: http://brawlplus.net/install-guide/
The exact number of song's in SSBB is 258. I know because I counted every song on the smash bros dojo website under music then scroll all the way to the bottom and you will find a button with ????? on it, click it and you then click on full song list with secret song and you will have every song in SSBB!!!
To play ssbb online make sure you have a wi-fi connection on your wii. (you can check that under Wii options in the wii menu) On the main SSBB screen, choose Nintendo Wi-Fi.
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