You can see my stats, I did not maxed my speed. Maybe it is unplayable then and I would probably would not want to play it again from the beginning. Now there are always tons of coins that I do not need. At least I am not color blind, but they are still confusing.

In "Highscore", "Upgrade", "Menue" and "Info" it is still in the act method. I have a question. When I click on "reset", is everything deleted then or can I change the upgrades then? I ask because I don't know if I should max out the speed.

Much better than with the lags! By the way, you have setPaintOrder methods in your menu worlds in the act methods. Better put them in their constructors.

You better get a good score here, before you say this. :P Are they random created or did you make a list of possible tasks? If they are not random, it would be easy for you of course...

Are you sure that this is based on "http://www.greenfoot.org/scenarios/1079"? It does not seem like they have anything in common.