"Upgrade Battle" will occurs when Racer Class Gauge is full.
When you win in this "Upgrade Battle", your "Racer Class Gauge" will be promoted!
When "Racer Class" becomes "A3" or higher, your car will shows the "Aura" before the race.
Color of "Aura" will be changed when you rise of your "Racer Class".
Various missions are available in each mode.
When you achieve a row all the missions, you'll earn and "Driver's Point" and "tachometer".
If you want to advance faster tuning, let's challenge aggressively!