Stardew Valley Mobile Has A Secret Co-Op Mode That Can Only Be Accessed Via The Konami Code
Briefly

"With the release of Stardew Valley 1.6 on mobile, there is now a hidden multiplayer feature which you can access. It is hidden for a couple of reasons: 1. It's an experimental feature, so it might still have some bugs or issues. 2. The nature of the mobile platform could make a multiplayer session frustrating under certain scenarios."
"The ideal 'mobile multiplayer' scenario would be to connect to a PC-hosted farm from a high-end mobile device on a local network (using Wi-Fi, unless you have some way to connect your mobile device to ethernet)," Barone explained. "This would be the best-case scenario. If you try to connect or host using a cell phone network, you will likely encounter problems."
"Barone said that mobile multiplayer works pretty much the same as on other platforms, but noted that it did lack the 'farm discovery' feature included in other versions of the game. Mobile players can only connect to multiplayer by sharing their IP address or entering the host's IP address."
Read at GameSpot
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