@aidan,
I understood a bit but not completely clear .
I reminds me a TV program 'Who Wants to Be a Millionaire' where quiz questions are asked ..and for each questions your money will be doubled ...and for wrong there will be penalty by decrement.
I think you mean the same...but when you say 'big money round' ...do you refer to the maximum prize money when one answers all correctly ? alternatively ,what is this 'big money round' ?