It should be a patent application
But just having a game is not enough, you also need to have a product, and then apply for a patent for the design
Apply for a design patent. It is necessary to prepare the appearance views of the six sides of the product, fill out the "Design Patent Application" together with a brief description of the design, and submit the application documents to the National Patent Office.
After submitting the application, you can get the "Patent Acceptance Notice" in about a week; the Patent Office will issue the "Notice of Grant of Design Patent Rights" and "Notice of Registration Procedures" in about six months; pay After the patent registration fee and annual fee are paid, the license will be issued in about two months.
To determine the location, you can find the patent application agency in your city or the National Patent Office to apply.
The link is the application flow chart