The game starts when the player's character arrives in Tristram. Several of the remaining townsfolk assist the player such as Deckard Cain the Elder. The labyrinth under the Cathedral descends from the dungeon/church, to the catacombs, followed by the caves, and finally Hell itself, each with a mixture of the undead, animals, and demons. King Leoric has been re-animated as the Skeleton King.
The player moves and interacts with the environment primarily by way of a mouse. Other actions, such as casting a spell, are performed in response to keyboard inputs. The player can acquire items, learn spells, defeat enemies, and interact with non-player characters (NPCs) throughout the game. The dungeon levels are procedurally generated with themes for each level; for instance, the catacombs tend to have long corridors and closed rooms, while the caves are more non-linear. The players are assigned a random number of quests from several tiers; these quests are optional but usually offer powerful unique items as rewards and help to level up the character and/or reveal more of the backstory. The final two quests are mandatory in order to finish the game.
Source: Wikipedia, "Diablo_(game)," available under the CC-BY-SA License.
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