The voltage in the network is very important, modern household appliances are quite hardy and can withstand power surges, but too much difference between raising and falling is fraught with serious disruptions in operation, and even failure. In the Voltage game, you need to adjust the normal voltage by choosing the right combination of numbers. To do this, press the buttons with numbers, and then test by pressing the big green button with a black arrow. You can test your options ten times. The light bulb must remain green to complete the task. If yellow lights up, the voltage is too low, and red is too high in Voltage.