Since the game doesnt let you delete your progress and I looked trough the files of the game to find any indication of saved data, i still couldnt find anything. So that means that the speedrun of this game can also be done on an already completed save file. Since there is (yet) no way to erase save data.

So, in any% now Im wondering if you should be allowed to use the cars you unlock in the challenge modes, beceuase im uncertain. So i think ill make it so that you can only use the first 3 cars ( since you can use them from the beginning on ) and if you want to use the other cars, you need to complete the challenge modes (even if you already completed them off run ) so we dont have any advantages over someone for example who didnt complete the game yet. I hope we will find a way to erase save data soon.