You will need to beat this game, plus another three after that for the Mamba Mentality benefit. It is important to remember that you aren't in a position to win all four games at Brickley's Gym in one go. After winning the first game then switch back to MyCareer and play a few games. Brickley will contact you via your phone when he's ready and has more players available to face you, so check it after every game you take part in.
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