The movement is really realistic right now! What would make it even more realistic, is let the balls touch each other and than, let the other ball move in the direction the other ball hit him. To explain it a little bit better: Let's say there are 2 balls, ball 1 and ball 2. Ball 1 is moving, ball 2 is doing nothing. If ball 1 touches ball 2, ball 2 will move.

@Duta that doesn't work, because it takes greenfoot quite long to connect to the internet and get the "loadHighscores()" method (if you want to call it that way) done, so Spilli, can you teach me how you made it so your scenario's animatons went on when the highscore board was loaded?