HEARTS

Hearts (ハート, Hāto) is one of the types of games played in the Alice in Borderland series, characterized as psychological games. 

Hearts games require "playing with the hearts of others". Citizens who create Hearts games use the natural desire to live, that most people have, forcing players to manipulate and betray their allies, eventually killing them. Rules of many Hearts games also tend to mislead the players into believing that sacrificing other players is required to claim victory, but would otherwise be unnecessary if all participants could calmly deduce the true nature of each Hearts game[1]. 

Many of the higher difficulty Hearts games forbid violence, so players can only progress forward through manipulation and psychology and not by sheer force.[2]

Hearts games are commonly agreed by players to be the hardest, cruelest suit[3].