System for the Trauma RPG
Attributes range from 3 to 18 and can either be determined by rolling 4d6 and keeping the three highest.
Alternatively, the system encourages the players to play themselves, and provides rough guidelines on how to figure out the rough numerical equivalents of one's abilities.
Skill levels range from 1 to 26. Skill checks are determined by referencing the skill level + modifiers to the difficulty on a table to determine the maximum number to be rolled to succeed on a d100.
For pure attribute checks roll a number of d6 determined by the difficulty. To succeed, the total must be equal or less than the attribute.