u/No_Actuary_675

So I just found out the gane has multiplayer quests after already purchasing it last night. So I looked up to see if I can still 100% the game without doing multiplayer to discover that some basement library and witch's outfit are locked behind multipler. Needless to say I'm extremely peeved. Nowhere did they say that multiplayer was rewuired to fully complete the game/get the most out of it. I thought muliplayer was optional.

Is there no other way to get those things? If not how do I go about getting a refund? Do I have to contact Nintendo directly?