Splatoon 2 single-player lets you fight solo against the Octarians as you upgrade an inky arsenal of weapons. It’s a great way to master gameplay!
— Squid Research Lab
Source: Splatoon’s Tumblr.
…Wanna play? Buy a Switch.
And if you’ve already got yours, click on Splatoon 2 for everything you need to know about the game. 😀