How do you unlock ghostfreak in ben 10 galactic racing?

To unlock Ghostfreak in "Ben 10: Galactic Racing," you need to complete the "Ben 10" story mode, specifically finishing all the races in the game's main campaign. Once you've accomplished this, Ghostfreak will become available as a playable character. Additionally, you may need to collect a certain number of trophies or complete specific challenges to fully access him. Be sure to check the game’s requirements for any additional tasks needed!