Down to Hell is an action-RPG activity available within Diablo 4 that recreates the original game's campaign structure and iconic locations. The new mode takes players through Tristram Cathedral and descends into Hell itself, reimagining classic moments from the first Diablo while maintaining Diablo 4's visual presentation and mechanical systems. The activity aims to blend nostalgia with contemporary gameplay, translating the dungeon-crawling progression of the 1996 original into the framework of Blizzard's current entry. It represents a substantial callback within D4's content offerings, giving players a structured jaunt through Diablo's earliest setting and story beats.
via GamesRadar+
The new activity recreates "key moments from previous Diablo games, but built in D4's art style with D4's compelling gameplay"