Hi, I'm pretty new to greenfoot and I need some help. We're making a game for my coding class and I'm creating a version of the game Frogger. There is a frog that needs to cross a busy road in order to get to the opposite side of the screen. Right now I have two levels but the cars are going the same speed. I need to find a way to increase the speed of the cars with each level to increase the difficulty. Thank you!