How to use a Raspberry Pi as a Cloud Gaming Device

1. Install Raspberry Pi OS

First, install the Raspberry Pi Imager

Then, put your SD Card on your computer and run the app

After selecting the SD Card, you’re gonna select Raspberry Pi OS (64-Bit) or Raspberry Pi OS Lite (64-Bit) (to not have a desktop environment)

2. Install Moonlight streaming

curl -1sLf 'https://dl.cloudsmith.io/public/moonlight-game-streaming/moonlight-qt/setup.deb.sh' | distro=raspbian codename=$(lsb_release -cs) sudo -E bash
sudo apt install moonlight-qt

Before running Moonlight, press CTRL+ALT+F1 to change to a console environment for best performance (if you’re running Raspberry Pi OS not Raspberry Pi OS Lite)

To change back to the desktop environment, press CTRL+ALT+F7

Official explanation here

3. Run Moonlight

To run the application, just run this command on the terminal

moonlight-qt