Diablo normally requires the original CD to play, however also included on the disk is a shareware version of the software that could be played without the CD called Diablo Spawn. This version of the game allows access to only the first two areas of the dungeon, and locks out two of the three playable classes and many of the NPC townsfolk. It is playable in both single- and multi-player with those restrictions. The Diablo demo is also downloadable.
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In 1998, a PlayStation version of Diablo was published by Electronic Arts. The game lacked online play, but featured a two-player cooperative mode. It also featured an option to learn the story through a narrator without having to find the books in the game. This version was infamous because of its need for 10 blocks free on a PlayStation memory card; the standard size of memory cards for the platform was 15 blocks.
The only official expansion pack made for Diablo was Diablo: Hellfire in 1997. The expansion was produced by Sierra Entertainment rather than an in-house Blizzard North development team. The multiplayer feature of the expansion pack was disabled with version 1.01. The added content included two additional dungeon segments located within a new side storyline, several new unique items and magical item properties, new spells, and a fourth class, the Monk. There were also two possibly unfinished “test” classes (the Bard and Barbarian) and two quests which could be accessed only through a configuration file modification.
The original game was later re-released alongside Hellfire in a 1998 bundle, called Diablo + Hellfire. 1998’s Blizzard’s Game of the Year Collection contained copies of Diablo, StarCraft and Warcraft II: Tides of Darkness. The Blizzard Anthology (2000) contained Diablo, StarCraft, StarCraft: Brood War and WarCraft II: Battle.net Edition. The Diablo Gift Pack (2000) contained Diablo and Diablo II, but no expansions. The Diablo: Battle Chest (2001) contained Diablo, Diablo II and Diablo II’s expansion, Diablo II: Lord of Destruction. Later releases of the Diablo: Battle Chest also have a strategy guide for Diablo II and LoD,[10] though subsequent releases do not include the original game, instead featuring Diablo II, its expansion, and their respective strategy guides.