The Space Wolves Codex is a supplement for Space Marines in the Warhammer 40K game, published by Games Workshop in 2000. This softcover book contains rules and lore specifically tailored for players who command the Space Wolves faction, providing additional options and strategies for gameplay. With detailed information about the Space Wolves army and their role in the Warhammer 40K universe, this codex is a valuable resource for enthusiasts looking to enhance their gaming experience.