Difficulty Number Scale

DIFFICULTY NUMBER SCALE
Description           Difficulty Odds      Modifier
Very Easy                   3            80%           -5
Easy                           5            75%           -3
Average                      8            50%           0
Complicated             10             30%         +2
Difficult                     12            20%          +4
Hard                         13            15%          +5
Very Hard                 15             5%           +7
Extremely Hard        18              —          +10
Incredible                  22             —          +14
Nearly Impossible    25              —          +17