Draw three concentric circles. Begin by drawing the first circle with a 10 cm. diameter. Then draw the next circle with a 20 cm. diameter. The final circle can be how ever large you want it to be, as long as it fits in the box.  Draw four lines about 4 cm. from the outer circle.  Then you  cut out one divot, smaller than a regular-sized marble on each line for your marbles to set in. Next, cut out three holes that are smaller than a shooter and bigger than a mib, inside each concentric circle (one hole for each circle).  Now you come up with an appropriate amount of points for each hole.  You may write down your amount of points in the circle. Now draw a chord on each one of the circles.  Now you should color two of the radii of the large circle one color, and the other two radii another color.  Now you can clearly see four sections...all congruent. Also, both halves of the circle are symmetrical. (see picture below.)

 
 
 

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