That is incredibly impressive getting that far!
I'm not on PP though often help with my housemates one, and tbf to PP, those questions are as stupendously close to 50/50 choices as you can get - it's basically the same as winning 15 coinflips in a row, which is crazy odds, so big congrats on doing it dude and, leaving hindsight aside, £500 still epic profit for a freebie!