Distributed with previous versions of Chisel is an effect called 'Cleanup.' This effect has at least one bug at the time of writing: whilst it removes the correct number of lights from the map, the lights left behind are not the correct ones, merely the first lights in the map. This means that it only works correctly if the last lights in the map are removed. Enter 'Better Move Level' which fixes the bug, and adds two new features:)

As of Chisel 2.1, this effect replaces the original Cleanup effect. If you have downloaded Chisel 2.1 or greater from this site, you don't need to get this again.