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. 

How to Play Stardew Valley Co-op Online and Splitscreen - Pro Game Guides

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

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

Stardew Valley Multiplayer Beta: Known Issues & Fixes, Page 5

Stardew Valley Multiplayer Update -- Trailer & Release Date

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

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

Stardew Valley' PS4 Update Is More Than Multiplayer: Night Market, Horse Hats and More Love

So I've been playing multiplayer lately (Twitter/IG: hana_piana) : r/ StardewValley

STARDEW VALLEY'S Multiplayer Update Is Almost Finished — GameTyrant