I used this in a small class assignment. ScrollWorld and ScrollActor simplified a lot of stuff. Many thanks! You can find it here: http://www.greenfoot.org/scenarios/15036

I think I understand. You're saying "move 100 100th's" instead of saying "move 1", so you can define more precise distances? Also, could you clarify what the different edge behaviors are? Does "Chased" behave differently, or am I looking at "Chaser" behavior? I wasn't able to figure it out just from playing around.

Impressive stuff. I don't quite understand though how you managed to increment time into hundredths. I thought everything was stuck with the rigourous units of time and distance laid down by Greenfoot.