According to tinyBuild Support, the easiest way to connect with friends is via an :
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: Send this code to your friends. They must enter it at the main menu pause screen under "Enter Invite Code" . Crossplay and Performance According to tinyBuild Support, the easiest way to
: From the main menu, go to the Versus Battle or Wave Survival pedestals and select Online > Create a Match . According to tinyBuild Support
: Compete against friends or random players in rounds where the last spider standing wins.
: Jump into a match with random opponents online to test your skills.
: Once in the waiting room, pause the game and select "Show Code" in the top-right corner.