Noun
permadeath (countable and uncountable, plural permadeaths)
English Wikipedia has an article on:permadeathWikipedia
(video games, slang) Permanent death, where the player cannot continue but is obliged to restart the game from the beginning.
Character death As in other rogue-like games, NetHack features permadeath : expired characters cannot be revived without having made backup copies of the actual save files. Source: Internet
The result was a platform game incorporating the notion of permadeath in which the player takes an explorer character through randomly-generated underground caves. Source: Internet