Mahou Shoujo Ikusei Keikaku, Ousama Game The Animation Recommendations
I feel like every season has an an anime where there's a "game" and only one person can win everyone else dies- If you like watching death left and right and never getting attached to a character but love to watch the world burn this is for you lol.
- both use the - only one person can "Survive"
- both continue/repeat the death game/cycle over and over again
- both show the evil sadistic side of characters that seem innocent on the outside.
This is similar to Ousama Game The Animation because both of the main characters have to play a game for survival which shows many horrific death scenes.