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The good news is that Intense Battle Royale will be available in FPP in Custom Matches starting with this update which you can start even with just 1 friend.
LABS and Arcade, both of which currently service modes, will be merged during the second half of this year. The Arcade will then be expanded to service multiple modes simultaneously. The team is also considering making Intense Battle Royale available in the Arcade after the reorganization.
Starting with just 1 friend does not work.
Hey, looking into this, thanks for the info.