I've seen people scan them from phone screens but seems like always a hold up detecting it or something so I'd definitely recommend printing tickets
I can confirm you don't need to print them. I have called their office and checked the site. Please just make sure to turn up the brightness all the way up.
It is best if you print them out.
The people at the gate use a scanner. If your phone can display the entire bar code of each ticket you can use your phone. A printed ticket can also be used in case your phone reception goes bad. Good luck. I was there yesterday and had a great time. Short lines everywhere.
You'll need to print them out as far as I know.
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