Use the Siri Remote for game play
The Siri Remote includes an accelerometer and gyroscope that make it fun for playing a variety of games. Depending on the game, you can hold it either vertically or horizontally. Some games respond to movements you make in the air with the remote.
Use the Remote Loop. Attach the Remote Loop (sold separately) and maintain a secure grip on the Siri Remote to prevent injury or accidental damage to the Siri Remote or other property.
Some apps will also work with a third-party Bluetooth game controller or other accessory. See Connect Bluetooth devices to Apple TV.