I believe it's $15 all you can play and there's an option for like $20-$25 where it's all you can play and you can leave and come back as much as you want in the same day.
Pro Tip: If you love the museum and you're a local, ask for a stamp card. Every 10 stamps/admissions = a free entry.
Look on Groupon, they sometimes have a good deal.
Jordan's answer☝️is correct.
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