Settings

Control

Difficulty

Little Driver

Helper that steers down the track

For Grown-Ups

One-time setup for the best ride

Install to the home screen. Open the browser menu and tap "Add to Home screen". It then opens full screen and works offline.
Take the phone off silent so the engine and coin sounds play.
Turn on App Pinning (Android) so a tap cannot exit mid race. Phone Settings, Security, App pinning, then pin this app.
Keep the screen awake. Raise the screen timeout in Display settings, or keep the phone plugged in.

Your place is saved.