death game
A genre of fiction (manga, anime, games, novels) where characters are forced into a contest or situation in which losing means death. The term is used as a genre label, not for real-life deadly games.
There are many death game anime series lately.
This manga has a death game setting, depicting a psychological battle for survival.
Wasei-eigo (Japanese-made English) from 'death' + 'game'. Not a direct loan from English; the term was coined in Japanese to describe a specific fiction genre.