How do you unlock the last three levels on potty racers 3

I was thinking going the 20,000 distance and reaching mars? If I go to mars, it will only let me return to title screen and reload my game. It does say to stay tuned in the end, possible an expansion?
it must be an expansion, flew the 20k meters then went to mars, did not unlock any new level ....going to try flying the 20k and landing?