You can buy ahead and there
If you can buy ahead then definitely do that
You can do either of the two options
You can buy tickets at the door... But during busy times or new movie there is a good possibility of being sold out. Kiosk are also available to buy tickets. All seats are assigned and reserved. I recommend buying tickets in advance so you won't be disappointed.
It's reserved seating, so it is better to buy ahead online. If you are not too worried about seats then you can buy it in person.
You can use both but its reserved seating so you might want to buy ahead
For box office hits, you may want to do it ahead of time
Both
Either
You can get ticket over there
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