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Splatoon 2 appears to be designed to be played with friends, but also supports offline and solo play. If you are unable to play your game online, there is still a single player component that you can access once you have the game.
Access to single player missions in Splatoon 2
You can start the single player missions in two different ways, depending on which set you want to play. For single player missions that were available at launch, contact Marie. Marie is the person with the yellow and green umbrella in Inkopolis Square. If you get closer, she’ll go down the drain, so just push ZL her to climb down the drain. She will give you missions that you have to complete.
Related: How to get new hairstyles and haircuts in Splatoon 2
The second method comes with the Octo Expansion DLC released in 2018. You must enter the back alley in Inkopolis Square to start these missions. Back Alley is right next to Murch. Go inside the closed subway and press the A when you see the prompt listen carefully… This will start the single player expansion missions.
Can you play Splatoon 2 in split screen/local multiplayer?
Splatoon 2 does not support split-screen play or offline multiplayer. To play with friends, you need a Nintendo Switch, a copy of Splatoon 2, and the ability to play online. This is something that might get added in Splatoon 3, but we won’t know until it comes out.
For more information on Splatoon, see Splatoon 2: How to Add Ability Slots and Reroll, or does Splatoon 3 have a single player mode? here on Pro Game Guides!
https://progameguides.com/splatoon-2/how-to-play-splatoon-2-offline/ How to play Splatoon 2 offline