You dont need a reservation, but it definitely helps!
No
No reservations required
I did not have a reservation and I walked in without any trouble
Reserve tickets online first
Yes. Everyday requires you to get a ticket online first. It's free, and does not get you around the line, so get there around your ticket time and wait in line. It doesn't matter if you're early or late as long as you're close to your time.
You need tickets to reserve time to enter. Times are staggered so not over crowded.
Thanks! Your answer is awaiting moderation.