but what is his actual power? Forcing people to play games?
My personal theory is that when giving part-Dixingians powers, the Merit Brush's holder can affect them – so Feng Qubing didn't get the healing power his long line of doctor ancestors had, but rather a life force exchanging power. I imagine Zu Ma might've had some video-game-adjacent power, and then it was twisted into "creating a video game with a select person as the player". (Also, that was kinda crap game design – two thirds of the tasks are just random chance, while gamers in general love being able to improve and show off their skillz.)