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Move your mouse over the screen.
Press x or y to create balls, where the mouse is!
Press c to clear all balls.
I added a maximum of 100 balls, so don't be surprised if the balls suddenly remove, by creating new one! ;)
The blue balls and red balls are affected by the gravitation.
The blue balls swim on the water, the red ones not.
The yellow balls fly upwards!
The green balls are not affected by any gravitation, but they are getting slower, cause of the air resistance.
(P.s.: If you want, you are of course allowed to copy this scenario and use it for your own projects.)