Another modifier is drawn from the Value System, which is similar to the Mayfair Exponential Game System found in Mayfair's "DC Heroes" and "Underground". A Value number is assigned to a geometrically-increasing amount of time, distance, or mass (for instance, a Value of 15 is equal to 1000 units, which could be seconds, meters, or kilograms). The big trip-up is that minutes and hours are figured in blocks of 60 rather than 100, days are figured in blocks of 24 hours (and are more or less hours than that on other planets), and so on. The conversion rules to figure out time values in Shatterzone are complex and still don't work.