Connect your Stadia Controller to a device - Stadia Help

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Thu May 30 2024 07:39:25 GMT+0000 (Coordinated Universal Time)

Saved by @curtisbarry 

Yes. In Bluetooth mode, you can use tandem mode to connect a second controller to your wirelessly connected Stadia Controller.
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https://support.google.com/stadia/answer/13067284?sjid