what i did to get topless rider on my game is let my friend that plays video games to beat them not to have fun borrow it until like a week after he told me he unlocked it and then i asked him if he would come over and unlock it for my system. i know its the lazy way of doing it but hey it worked and he's only got five challenges left until he beats the game. and those are like collecting things and gaps. he unlocked it in 2 tries on the first challenge level and 1 try on the second challenge level.

hes good