Ink Mines.
☆ NintendObs Weekly – Monday, June 5, 2017 – Sunday, June 11, 2017.
This is the Ink Mine sub weapon. Basically, it’s a trap that you place on the ground. When an opponent gets close, it activates, revealing their location to your teammates. You can place up to two at once.
— Squid Research Lab
Source: Splatoon’s Tumblr.
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