☆ NintendObs Weekly – Monday, September 24, 2018 – Sunday, September 30, 2018.
These are the featured October Ranked Battle stages. The new stage, Skipper Pavilion, will be added to the game through the Ver.4.1 update and will join the stage rotation in early October.
— Squid Research Lab
Source: Splatoon’s Tumblr.
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And if you’ve already got yours, click on Splatoon 2 for everything you need to know about the game. 😀