Don't know off hand but if you go through the ticket purchase process and the second step after Showtime and number of tickets it shows you the screen to reserve your seats and that will show you the total seats. The giant screen theater has a number of seats around 75 or so. You aren't packed in like sardines.
The Imax screen holds about 200. Possibly more, as I didn't count. Seemed like 7 or 8 rows of 30 seats each.
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