No it is not required that you eat or drink during the movie. You can simply go and enjoy the movie no problem.
nope. you may order just drinks, or snacks, or food, or nothing at all.
No. The ticket price is all that's required.
No you don't have to order food, but it's n8ce to have something brought to you before the movie or even during.
No need to order and they don't even ask you. If you want order, there is a button for each seat.
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