DONT PAY EVER!
I had some copyright warnings due to my music remake videos. You should know you can ALWAYS use copyrighted stuff according to the fair use as long as you dont make money nor cause a significant harm to their profit. I encourage you to make use of your RIGHTS. I usually include this copy-paste somewhere in the description, Its like a shield aganist those $%$
THE USE OF ANY COPYRIGHTED MATERIAL IS USED UNDER THE GUIDELINES
OF "FAIR USE" IN TITLE 17 § 107 OF THE UNITED STATES CODE AND SOME OTHER COUNTRIES. SUCH MATERIAL REMAINS THE COPYRIGHT OF THE ORIGINAL HOLDER
AND IS USED HERE FOR THE PURPOSES OF EDUCATION AND
CRITICISM ONLY. NO INFRINGEMENT OF COPYRIGHT IS INTENDED.
You are allowed to use copyrighted material for historical, educative, criticism or parody purposes. I think the better is state clearly its a fanmade game with educative purpose. Just post the game with the source, and explain a little how you did the game, not much. Instant win.
this video is a fine example of this
[ Show youtube player ]