Steps (Raspberry Pi Imager or Etcher — equivalent in others):

To ensure stability, always download the version specifically built for the Raspberry Pi 3 (Broadcom BCM2837 architecture) . Visit the Batocera Download Page and use the "rpi" filter to find the Raspberry Pi 3 model.

: Connect a USB controller. Most (like Xbox or PlayStation controllers) work out of the box. If yours isn't recognized, hold any button to enter the mapping menu. 4. Adding Your Games (ROMs)

A gaming console isn't complete without games. To fill your 32GB card with ROMs, you have two main paths:

Here is some text regarding downloading Batocera for a 32GB Raspberry Pi 3: