You can buy them online before the showing. Just remember that because you have tickets that doesn't mean they will have enough seats for a party to all sit together unless you get there early enough to get seats. Depends on how popular the movie is/what day it is also. You will have seats.
You can order tickets but you will pay an extra fee. You are better off arriving an hour before start time. That saves a per ticket fee and ensures your entire party can sit together
Yes you can!
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