That is mainly because I don't know how to make it accept multiple answers. If you could guide me on how I would be very happy! I will also be making a sequel so check that out when it comes out! I will play that quiz for you. Thanks for the comment!
In quiz edit mode, go to the type-ins page and maybe add Rainbow and Heaven & Hell to the Dio answer. Also, you should edit the "quiz instructions" so it doesn't say "quiz instructions"!
On the first page of edit mode, where it says quiz instructions, erase that, and then write what the quiz instructions should be, like "Write the band these musicians are from."