The basic idea of the game is to produce enough electricity to light up the entire city without causing a dreaded Nuclear Power Plant MeltDown! This is done by raising the control rods to start the nuclear reaction in the core. When the control rods are all the way down, there is no nuclear reaction. When the rods are fully raised the nuclear reactor is maximum. This produces heat which is pumped to the Heat Exchanger by the Primary Coolant loop. When the Heat Exchanger temperature rises above 220 degrees it begins to produce steam. The Secondary Coolant loop pumps this steam to the Steam Turbine. The Steam Turbine begins to turn, driving the connected AC Generator and you get electricity! The steam then travels to the Cooling Tower where it condenses back into water and is returned to the Heat Exchanger to again produce steam. To begin, you need to start the Simulator by clicking the 'Start/Reset' button (flashing red light). Also turn on the Primary and Secondary coolant pumps. Click on the '+' buttons and bring up all 3 sliders a little to start the reactor. You will have to find the right combination of settings to produce power and not damage any reactor components by exceeding their limits. All of the reactor components have their limits marked. If you exceed them and don't correct the problem, you will sustain damage which is displayed in the Repair Facility section of the game. If any of the reactor components flash the 'Warning' condition, quickly reduce the slider that caused the condition. As long as the 'Warning' condition flashes, you will sustain damage for that component. In the Repair Facility, this damage is indicated in two different ways. The first indication is the condition percentage which starts to drop from its original 100%. If it falls below 75% you will get a second indication of trouble with a flashing yellow light. If the light flashes red, the condition of the particular component has fallen below 50% and has FAILED. This causes the Simulator to enter PAUSE mode. You can operate the reactor even if some components are below 75% (Yellow - condition). But you cannot if any components are below 50% (Red - failed condition) To continue, you must pay money (if you have earned enough) to repair the bad component. Click the bad component and the information box will show you the price to Repair it. If you have enough money, click 'Repair this Item'. You can then unpause the Simulator and continue the game. If you don't have the coin, you can click 'Start/Reset' and start a NEW game. If you have a MeltDown because Reactor Core temperature exceeded 1200 degrees, you will have to start a new game. You can repair the reactor if it Fails, but not if it Melts Down ! Remember, as long as a reactor component flashes 'Warning' you are sustaining damage (approximately 1 % each second).