If you can locate them in an email on your phone then sceeenshot so they can scan the barcode otherwise when you arrive they have a membership office near main gate that will have computers and people working there to help you look them up. Best of luck.
They might have sent you an email with the ticket to print out or it might be a e-ticket where they scan from your phone. Hope that helps!
Go to six flags official website and enter the specific park. Enter email and phone details that you used during the purchase and you should find them there. Hope i could help!
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