![Game Progress](img/howto/howto_title_05.png)
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"Upgrade Battle" will occurs when Racer Class Gauge is full.
When you win in this "Upgrade Battle", your "Racer Class Gauge" will be promoted!
![](img/howto/05_01.png)
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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".
![](img/howto/05_03.png)
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!
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