If you can't play splatoon with pretendo, try changing your DNS settings the following. primary 88.198.140.154 secondary(Choose from what you like) Google DNS 8.8.8.8 Cloudflare 1.1.1.1 Adguard DNS 94.140.14.140 I hope it will be helpful to you!! :)
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Where did you get this information?
I added my knowledge to the information on Japanese websites.