MRPS: Milieu Role Playing System is a light-weight and generic, universal role-playing system. It is adaptable to any genre. Characters have Attributes (for example, Strength and Dexterity) and Skills. Skills are divided into Combat and Non-Combat Skills, the only mechanical difference being that Non-Combat Skills are capped at Level +15 proficiency. A Skill Level of 5 is considered "Qualified" while 8 is considered "Expert". When Skills are used the player rolls 1D20 and adds either their Attribute or Skill modifier, whichever is appropriate. This value must match or exceed a target Difficulty.
The Difficulty is derived from the task's narrative description of Easy, Routine, Moderate, Difficult, Formidable, or Impossible. This description is cross-referenced to the campaign style (Realistic, Cinematic, or Heroic) to obtain the Difficulty, which ranged from 5+ to 30+.