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Acme Petey, You need to finish the race! (theres a finish line at the end.) so do all your stunts, then leave the half pipe before the times up! Hope this helps. Also coming in last place will stop you from getting unlocks, you have to be at least ninth!
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Why do I get green boxes for the achievements, but when the race is over I failed the achievement? This is expecially true of the Half Pipe Booster Badge. I've held the boost level 11 for 15 or more seconds.