Q1 : What do the levels mean?

These indicate your game progress throughout the entirety of Maximum Tune 5.

Q2 : What is the first level?

It's the N class.

Q3 : How do the levels increase?

N class → C9 class → C7 class → ... → C1 class → B9 class → B7 class → ... → B1 class → A9 class → ...?
Your level never goes down.

Q4 : What are the conditions required to level up?

We can't tell you everything, but we'll tell you a little bit about the first stages of the game.

・Story Mode
　Level up one level for every 10 episodes cleared
・In-store Interruption Versus Battle

Outrun Stars:

Level up one level with 20 stars earned
Level up one level with 50 stars earned
Level up one level with 100 stars earned

・Online Ghost Versus Battle Mode

Victory Count:

Level up one level with 20 wins
Level up one level with 50 wins
Level up one level with 100 wins

Q5 : Are people with high levels good?

They're "great!"

Q6 : What is the highest level?

Find out for yourself.

Q7 : Where can I check my level?

A7: It's always displayed in the bottom right corner of the screen during the race, and on the Car Data Confirmation Screen (1/8) on the drive machine or the Wangan Terminal.