text: A further Doom game developed by id Software on their new id Tech 5 game engine , Doom 4 , was announced in May 2008 , although the game is not going to continue the story of Doom 3 .
simplified: It was created by iD Software , and came out in 2004 . It was the first to not be based on the same game engine as Doom and Doom 2 , and had 40 levels .