The 100AC System[...]contains rules text and resources to allow you to use 100AC System, the task resolution system behind Dusk City Outlaws and Spectaculars, to create your own games or make modifications to games you play. The system combines percentile dice with proprietary Advantage Dice and Challenge Dice to give task resolution a broad spectrum of successes, failures, and additional benefits and consequences each time you roll the dice. It is simple, fast, and easy to learn.
In a 100AC System game, when anyone attempts an action and the outcome is not guaranteed, you roll the dice. Each roll includes percentile dice (d100), and the number rolled on those dice is compared to a percentage chance of success; rolling equal to or lower than the chance of success number means that they succeeded in the action that was being attempted. Rolling higher than the percentage chance of success means the attempt failed.
Additional positive and negative circumstances surrounding the roll also add white advantage dice (for positive circumstances) and black challenge dice (for negative ones) to the roll. Each of these dice have symbols on them that indicate additional positive (on advantage dice) or negative (on challenge dice) outcomes to the attempt. Up to four of each of these dice can be added to the roll, giving a broad spectrum of possible dice pools while still keeping the roll relatively uncomplicated.