Facts · platform check
Where can you play Mortal Shell II?
Use the official store entry for the platform you actually intend to use. Keep platform availability separate from multiplayer promises.
Current official entries
PC
Steam
Steam AppDetails currently marks Windows as available and macOS/Linux as unavailable.
Console
PlayStation
Official PlayStation concept/store entry.
Console
Xbox
Official Xbox store entry.
Important boundary
These links confirm official listings. They do not confirm crossplay, cross-save, or identical release timing. Treat those as separate pages until an official statement or reproducible test is available.
Sources: Steam AppDetails · PlayStation · Xbox