In working with Dr. Michael Mascagni. I am looking at inverting FSU's random number generator SPRNG. Such that in the reversal of SPRNG, at any point if the reverse() method is called, the numbers will generate in the reverse order of the original period. regenerating past numbers if they began to generate earlier. this reversal will work uniformly forward and backward in most circumstances. Not all generators can theoretically generate the numbers in reverse. Not all generators can generate in reverse at a reasonable speed.