Your investigator’s characteristics, like Strength, Dexterity, and Intelligence, as well as their skills, have a value out of one hundred. The higher the number, the better their ability. Each of these values is a percentage, so when asked to make a roll to determine how well your character is doing something, you roll percentile dice. If you roll lower than or equal to your value, then you usually pass the test. If you look at your skills, the ones with the highest numbers are the things your character is best at doing.