On a forum I'm on they have a weekly quiz for some member groups. It has three levels. Get the first question right and you get X amount of credits. You can take that or move to the second question. Get that right and you have the choice of taking that amount or risking it all for level three. Get that right and the credit is yours. Get it wrong and you get nothing.
Is there an add on that will do this for xenForo? If not is there anyone that is able to make one that can work with some of the banking systems available?