Puyo Puyo Sun 64 - Platform: Nintendo64

Reversed character select:
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Highlight Draco (the training character, far left in the 
front row) and hold Start. Player one will be able to choose 
player two's character and vice versa. 

Play as Carbunkle:
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Highlight Arle (the main girl character, second from left in 
the front row) and hold Start until Carbunkle appears. 

Play as Satan:
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Highlight Shin (the character to right of Arle) and hold Start 
until the Satan appears. 

All characters are elephants:
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Highlight the elephant (far left in the back row) and hold Start. 

Random character select:
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Highlight Lulu (far right in the front row) and hold Start.