System Reference Document

SKILL TESTS 

Skill Tests are like Attribute Checks, with some important differences. When making a Skill Test, as with an Attribute Check, a lower roll is always better. A Skill Test is resolved as a modified Check of the Skill’s Linked Attribute, which is adjusted as indicated below. 

Similar to Attribute Checks, in general, whether or not a failed Skill Test can be retried is up to the GM and should be determined based on the situation. Likewise, the time a Skill Test takes is up to the GM. 

A natural 2 (snake eyes) on a Skill Test is always a success. 

A natural 12 on a Skill Test is always a failure.