Recently I purchased a Challenge of the Dragon prototype for Famicom, and while it is somewhat obscure, it is historically significant as well.  For those that haven't seen it yet, feel free to check out the article below:

https://fcgamer.wordpress.com/201...

Very cool and interesting read about some very obscure NES game dev stuff! Thank you for that - it was enlightening!

That game looks cool too for an unlicensed one.