Do I need to print out the tickets I bought on the computer？Can the scan code on the mobile phone be shown four on the same mobile phone?

I use my phone

Both options work. I prefer the phone.

I used my phone personally

Better to print

You can do either print ornuse your phone

I made a screen shot of the online ticket and showed it at the entrance. Everything was fine

Scan from phone. All you need is a barcode

You can print out the tickets if you want. However, if you download the app and can get the tickets on there, then you can just use the app.

You can do either, I used my phone with the email