The pads are only for vip, or that was the case this past Sunday. The third "room" in the experience has a few seats in parts. You'd be best there. It's really only four rooms, three display the interactive experience simultaneously, so once you've seen one room you've seen the other two. The only different room has the letters on the wall. The gallery should be ADA compliant though and should give you priority to seating.
No, they give you pads when you check in . You sit anywhere you want on the floor. The way the times are structured the place is not crowded at all.
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