STARDEW VALLEY Will Have Local And Online Multiplayer Mode On Next Update — GameTyrant

Eric Barone, the one man developer of Stardew Valley, is currently working on an update that will introduce multiplayer support on the hit farming simulator. 

Stardew Valley Multiplayer Beta: Known Issues & Fixes, Page 252

Stardew Valley Multiplayer Not Working Fix 2023

Stardew Valley's multiplayer update for Switch is finished, now in testing

Stardew Valley 1.5 Update: 3 Reasons To Be Excited (Splitscreen Multiplayer!)

STARDEW VALLEY For Nintendo Switch Releasing Soon — GameTyrant

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Stardew Valley Multiplayer - all you need to know!

Stardew Valley adding separate multiplayer finances

Stardew Valley Update 1.5 Confirmed for Mobile Before the End of 2022, No Multiplayer Signs - timenews