Two players can use a single Switch to team up online.
There’s no need to play online alone; two friends can team up on the same Switch to play against other two-player teams.
It’s not clear whether cooperative matches will impact your GSP, but bringing a friend in on the action will be easy.
Can 2 players play online on the same switch?
1. Yes, but if you have multiple accounts on your Switch (other people, not multiple accounts owned by you), you can buy a family membership that allows up to 8 accounts, it’s £31.49/$34.99.
How do you play smash with two people?
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How to Play 2 Players in Super Smash Bro Ultimate with One Joy
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How many players can play online Smash Bros Ultimate?