Not that great All you can do is click on the map ->click go to garage->click on any upgrade (order doesn't matter) -> click go -> rest your thumb on the pedal... Nothing else... Then you will get some money... -> click on any upgrade of your choice.. click go-> rest your finger on pedal and continue the same..... Nothing changes... You will have to play the same level again and again....(as many times as set by developer.. once all upgrades are done rest your finger on pedal and hola.. done)