Yes, finish the first race day in super promotion (Challenge
Race) and choose the Viper in the choose your Prize Car menu.
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YOU OPEN YOUR BAG,THEN GO TO KEY ITEMS AND FIND ''SUPER ROD''.
THEN PRESS ''A'' AND CHOOSE USE WHEN YOUR NEAR WATER OR YOU CAN
CHOOSE REGISTER. THAT WILL LET YOU USE IT WHEN YOU PRESS
SELECT.
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Go to 1 player then choose multi man melee then choose cruel
melee.