To start the game you push a button to start the red, green and yellow LED spinning action. The spinning speed of the LEDs gradually decreases and finally stops, leaving only one LED lit. The LEDs are numbered 1 through 10 on the PCB. The electronic circuit implements two integrated circuits (CD4069 – hex inverter and CD4017- decade counter) to simulate the spinning action. This kit includes a 9V battery holder that attaches to the back of the PCB.