I added a version of "duck hunt" into a web app once. IT WAS EPIC! It maintained scores in the backend database and would show high scores at the end of the game. The site wouldn't load the code/content until you performed the special action to start the game.

Most of the serialization issues are from them switching from Newtonsoft to System.Text.Json. Beware if you have your own custom converters or attributes to change the serialized property names!