https://www.pcgamer.com/heres-how-doom-eternals-extra-lives-work/

When DOOM Eternal’s gameplay trailer debuted at QuakeCon last week, one element that surprised me was the “Extra Life” powerup that briefly appeared on-screen in between DoomGuy’s demonic eviscerations. While I’m all for DOOM’s newly old style of play, surely re-introducing the concept of “lives” is going a bit far.

Luckily, Marty Stratton, Doom Eternal’s executive producer, has since explained how DOOM’s extra lives work. “It’s just like our checkpoint system,” he said in an interview with VG247. “It’s just now you don’t have to go all the way back to the checkpoint and play back through that combat encounter.