The D&D Miniatures Game Battle Rules contains all the rules you'll need to cover most situations, casual or competitive. You can download a copy of that rulebook from the D&D Miniatures website at http://www.wizards.com/default.asp?x=dnd/minis.
However, some situations call for more detailed and more precise rules. This document is intended to be the ultimate authority for the game; you usually won't need to refer to these rules except in specific cases or during competitive games.
This document includes a series of numbered rules followed by a glossary. Many of the numbered rules are divided into sub-rules. Each separate rule and sub-rule of the game has its own number. The glossary defines many of the words and phrases used in these rules and points to more detailed rules that cover each item, but does not contain rules.
The DDM Oracle team recognizes that no matter how detailed the rules (and these rules are detailed), situations will arise in which the interaction of specific rules text, creatures, powers, or effects requires a precise answer. If you have questions, you can get the answers from us here.
→ Download the Comprehensive Rules Guide (Updated 7/31)
→ Download the DDM Comprehensive Rules FAQ
→ Download the Comprehensive Rules Delta Document
→ View the Stat Card Oracle (Updated 8/2)