1) This document provides an overview of the 4th Edition Dungeons & Dragons roleplaying game, including the core mechanic of rolling a d20 and adding modifiers to resolve tasks, and examples of combat encounters and actions players can take on their turns. 2) The core mechanic revolves around task resolution - rolling a d20 and comparing the total to a target number to determine success or failure. This governs all gameplay. 3) Combat follows an initiative order with players taking standard, move, minor or free actions on their turns. Noncombat encounters involve skills, roleplaying, and puzzles.