Port Mackerel
From Inkipedia, the Splatoon wiki
Template:Infobox stage Port Mackerel is an online multiplayer Stage in Splatoon. Much like Kelp Dome, it includes many corridors, such as ones around large, colored boxes and crates. This stage was not available at the launch of Splatoon, and It was patched in on June 1st, 2015.
Gallery
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Port Makerel shown in a pre-release screenshot.