The effects is a combination of mouse clicking and key pressing.
Once you left click the mouse, the colors of generating particles will change randomly
Press "G" add green; Press "Y" add yellow;
Press "M" add magenta; Press "B" add blue;
Press "P" add purple;
The colors of three pumpkins will change based on the key pressing
Use arrow keys to rotate the ground plane and view. And bounce the ball.
Press "R" , reset the camera;