Diablo 4 was officially announced in November 2019, with the game launching in June 2023. It promised to be the most ambitious and significant entry in the series yet, and Blizzard did a lot of things right and wrong for the game's launch period. Released in 1997, the first Diablo defined the isometric action-RPG hack-and-slash looting genre and every similar game since it has been referred to as a Diablo clone.