USB OTG cable needed to play Android games with USB controller. This gadget modifies a USB connection for phones and tablets.
The OTG-USB cable also lets you attach USB drives and controllers to Android. Our USB-OTG tutorial explains.
Buy a USB OTG cable first. Cheap on Amazon. Depending on your phone, pick USB-C or micro-USB.
Plug a USB OTG adapter into your Android phone, then attach a USB gaming controller. Open your game. Games that support controllers should detect the device.
Make your phone Bluetooth-discoverable. Enable Bluetooth in Settings > Connected devices > Connection options.
Tap the controller's name to connect. Like USB, games that can utilise controllers detect them at startup.