This is the colour, direct purchase version. Do not buy the more expensive version meant for Amazon distribution. Better Mousetrap is an extensive supplement for the Mutants & Masterminds 3e rules. Written by Steven Trustrum, contributor to the DC Adventures product line, and illustrated by industry veteran, Eric Lofgren, this massive sourcebook covers everything from how to create interesting, challenging super-villains to new game mechanics (advantages, extras, flaws, Expertise variations, and more), to entirely new rules that will help you take your game to a new level of excitement.