The tickets given by others are level 1. Yes, can I pay the difference to upgrade and enter the park during the summer vacation?

Hong Kong Disneyland Main Entrance Ticket Booth or Guest Service Center, Hong Kong Disneyland Hotel or Disney’s Hollywood Hotel
I’m not sure, it seems like that’s not allowed, right?
Absolutely, feel free to use it.
Sure, as long as your ticket is unused and not expired, you can upgrade to a two-day ticket by paying the difference at the following three places:
Hong Kong Disneyland Main Entrance Ticket Booth or Guest Service Center, Hong Kong Disneyland Hotel or Disney’s Hollywood Hotel
Don’t know, it seems not allowed, right?
Absolutely, feel free to use it.
Yes, as long as your ticket is unused and not expired, you can pay the difference at the following three locations to upgrade to a two-day ticket.