The present invention relates to the "Magnetic pistons engine", hereafter called "Maps engine" or "RAT engine" or "engine" that works on the principle of magnetism. It can be used to perform various tasks and functions that involve application of force or displacement of objects. This method provides an environmental friendly, very high efficiency engine that can complement or replace any engines that use fossil fuel, bio-fuel, solar power, wind power, hydro power, electricity, stored energy, or other energy sources.