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Wiktionary
permadeath

n. (context video games slang English) permanent death, where the player cannot continue but is obliged to restart the game from the beginning.

Wikipedia
Permadeath

In role-playing games, both for tabletop and computer, permadeath (or permanent death) is a gameplay mechanic in which player characters that die are permanently dead and removed from the game and may no longer be used to play. Less common terms with the same meaning are persona death and player death. Games without permanent death may allow characters who are killed to be resurrected to a playable state, with this action often costing resources or undoing progress the player has made.

Permanent death is commonly a component of roguelike role-playing games and massively multiplayer online role-playing games (MMORPGs), although it is sometimes used in discussions of the mechanics of non-electronic role-playing games. Ewen Hosie of IGN states that though action games frequently employ this gameplay element, it carries no emotional weight. Game developer Andrew Douall identifies permanent death as a pillar of roguelike game design. According to Hosie, the roguelike Dwarf Fortress "does [not] even allow the player to win in any traditional sense".

Implementations may vary widely. Casual forms of permanent death may allow players to retain money or items while introducing repercussions for failure. This can reduce the frustration associated with permanent death. More hardcore implementations delete all progress made. In some games, permanent death is an optional mode or feature of higher difficulty levels. Extreme forms of permanent death may further punish players, such as The Castle Doctrine, which has the option of permanently banning users from servers upon death. Gamers may prefer to play games with permanent death for the excitement, the desire to test their skill or understanding of the game's mechanics, or out of boredom with standard game design. When their actions have repercussions, they must make more strategic and tactical decisions. At the same time, games using permanent death may encourage players to rely on emotional, intuitive or other non-deductive decision-making as they attempt, with less information, to minimize the risk to characters with which they have bonded. Games using permanent death more closely simulate real life. Games with a strong narrative element frequently avoid permanent death.