The trademark registration of online games can cover multiple categories, and the specific categories depend on the different aspects and functions involved in the game. The following are some common categories that may be applicable to online game trademark registration:

1. Category 9-Computer and electronic game software: This category is applicable to trademark registration related to computer and electronic game software. It includes game programs, game applications, game media, game control devices and so on.

2. Category 16-Game-related printed matter: This category is applicable to game-related printed matter and publications, such as game manuals, game guides, game posters, game magazines, etc.

3. Category 25-Game-related clothing and accessories: This category is applicable to clothing, shoes, hats, accessories, etc. related to game brands, such as game-themed T-shirts and accessories for game characters.

4. class 28-game software-related equipment: this class is applicable to game software-related equipment, such as game controllers, game consoles and game equipment.

5. Class 41-Game entertainment services: This class is suitable for providing game-related entertainment services, such as online game services, e-sports competitions, and game activity organization.

please note that the above categories are just some common examples of categories applicable to online game trademark registration. The specific trademark registration category should be determined according to the specific characteristics and functions of the game. In the process of trademark registration, it is recommended to consult a professional trademark agency or legal expert to ensure that the appropriate category is selected and accurate trademark description is provided.

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