How do I access the hidden features in the Audi A8?

I've heard that the Audi A8 has some hidden features that can provide a better driving experience. Can someone explain how to access these features and what they do?

One hidden feature of the Audi A8 is the 'Drive Select' mode, which allows you to customize your driving experience with different settings for steering, suspension, and throttle response. To access this feature, press the 'CAR' button on the dashboard, then use the MMI controller to select 'Drive Select' and choose your preferred mode.