Diablo

Blizzard's Diablo arrived in 1996 and created the action RPG dungeon crawler genre. Selling 2.5 million copies in its first year, it introduced the addictive loop of randomized loot drops, procedurally generated dungeons, and relentless demon-slaying that would define an entire genre. Its dark gothic aesthetic and cooperative multiplayer via Battle.net set a new standard for PC gaming.