Crossplay

Is Deltarune: Chapter 2 crossplay?

Crossplay does not apply to Deltarune: Chapter 2: it has no online multiplayer.

Deltarune: Chapter 2 is the next installment of the sequel to beloved indie darling Undertale...in a different world! This time around, two more classmates join the protagonists in their adventure as they, too, discover a mysterious world hidden behind a door, called the "Cyber World". Players with no save data will be able to start right at Chapter 2. “As long as you generally remember what happened story-wise, you’ll be fine,” the developers said in an FAQ.