How do difficulty levels affect monster toughness?

Solution 1:

It's hard to guess the exact modifiers, but according to this guide (See "II. Walkthrough [W]"), the change is:

  • Hard ~= 125% for stats*, ~135% for HP
  • Normal ~= 100% for stats* and HP
  • Easy ~= 75% for stats* and HP

*From the guide and my personal experiences, it seems that stats like Speed, Evade, and Aim don't change (or it might be miniscule).