The player can acquire items, learn spells, defeat enemies, and interact with non-player characters (NPC)s throughout the game. Other actions, such as casting a spell, are performed in response to keyboard inputs. The player moves and interacts with the environment primarily by way of a mouse. About Diabloĭiablo is an action role-playing hack and slash video game developed by Blizzard North and released by Blizzard Entertainment on December 31, 1996. Download Diablo for free on PC – this page will show you how to download and install the full version of Diablo on PC.