The instructions are partially askew. Why say that the names are mentioned somewhere like that? If you used it as a source than simply make one caveat saying source: and then the link (<a href=""></a>). Other than that good idea!
Shady business going on here. I would save your subs not to every single person who takes your quiz but people who put effort into them. The whole "prize" idea isn't the best and it's not what JetPunk is about.