You can choose to race in one of seven series. At the start of the game, only Series 1 is unlocked. Each time you win a race, you will be awarded Flags. The number of Flags you win in each race is defined by what series it is in. There is also a maximum number of flags that can be collected in each series.

Winning a race in the higher series will award more Flags. However, when you lose a race, you will also lose Flags from your total. The number of Flags required to unlock a series can be found on each series panel. The entry fee for races increases in each series - but the amount you can win increases too.