You can make a "simple roll", which rolls a ten-sided die, with the "0" counting as "10". Or, you can make a "stress roll". If you roll a "1" on a stress die, you roll again and double it (with subsequent "0" rolls counting as "10"); if you roll another "1", roll and quadruple, and so forth. If you roll a "0" on a stress die, you roll a number of botch dice (usually one). Every other "0" that comes up is then a botch.