The Diablo series are probably the best known, and highest rated role-playing dungeon crawlers in gaming history. Taking place in a dark fantasy world where players take part in the ongoing conflict between the human world and the hordes of Hell, led by the titular Diablo. This series is cited by many gamers as a key part of their youth, and represents one of the first examples of online co-op play. Memories of hardcore raids on hordes of battle-axe wielding cows will always bring light into a gamers eyes.