To open a game category on Taobao, you first need to register a Taobao seller account. Then log in to the Taobao seller backend, find the "Business Category" option in "Store Management", and click "Apply for Business Category".

Select the "Game" category on the application page and fill in relevant information, such as game name, game type, game description, etc. At the same time, you need to provide relevant supporting materials, such as game version number, game developer qualifications, etc.

After submitting the application, Taobao will review it, and you can open the game category after the review is passed.