Diablo is a dark fantasy-themed hack and slash action-adventure game developed by Blizzard North and released by Blizzard Entertainment in December, 1996. Set in the fictional Kingdom of Khanduras (located in the Diablo series fantasy world of Sanctuary), Diablo has the player take control of a lone hero as he or she battles to rid the world of the eponymous Lord of Terror. Beneath the town of Tristram, the player journeys through sixteen dungeon levels to ultimately come face to face with Diablo and his demon minions.

Diablo was a best seller and following the first game's popularity an expansion pack, entitled Diablo: Hellfire, was released in 1997. This was followed by a true sequel, Diablo II, in 2000. The story of Diablo is based on the premise of a war between Heaven and Hell. The town of Tristram has come under attack by demons and the player must save the town and, in effect, the world, by ridding it of the Lord of Terror.

Glitches

Duplicate Items (2 Player Game)
In a two player game, toss any item from your inventory to the other person. Have them pick it up and save. Go and sell the item for gold and save your character. Start a new game, get the item back and you have money for nothing.

OR

Take an elixir and toss it to the other player. Have them save their game. Get the elixir back and drink it. Save. Start a new game and reverse the process if you want. More effective with multiple elixirs.

Character classes
The three character classes of Diablo are the warrior, rogue and sorcerer. Each character, following typical role-playing conventions, has his or her own particular traits. The warrior possesses physical strength, the rogue has high dexterity and the sorcerer is oriented towards magic.

Warrior: The warrior is a powerful melee fighter, master of weapons of war and capable of enduring more damage than any of the other classes. The background of the character states that they range from barbarians from the northern highlands to noble paladins.

Rogue: The rogues who appear in Diablo are master archers. They can have a higher level of magic than warriors and thus are able to make better use of magic in their battles, although not nearly as well as sorcerers. The rogues belong to a group called the Sisters of the Sightless Eye and are the best archers in the world of Sanctuary.

Sorcerer: A powerful master of the arcane arts, the sorcerer is the hero that is able to achieve the greatest heights of magic, so that he doesn't have need of physical weapons. In the game story, sorcerers belong to Vizjerei mage clan and have come to Tristram seeking to discover long lost tomes of magic knowledge under the cathedral.

Some gameplay footage in the video below (sorry for the Swedish language):