Swedish is also spoken in Finland as a national language, and a mandatory school subject. They are all fluent in English regardless, but it’s nice to be able to communicate in one of the local languages. It’s the official language in the Åland Islands archipelago, and a second language all along the southern coast plus the greater Espoo/Helsinki area.
I’ve got full working proficiency in Norwegian (B2/C1 I guess, never took the Bergenstest) and can talk perfectly fine with a Swede. We understand 80-90% and can guess the rest. Danish is though though, the written language is 99% identical with Norwegian, but they have a very guttural way of forming sounds that makes it hard to understand. The pronunciation is closer related to Dutch than to any other Scandinavian language.