ジョハリのマド (Johari's Window)

Johari's Window is a psychological term that is proposed by two psychologists, Joseph and Hari, to reveal or hide one's own mind from four perspectives (windows) and to understand one's own and others'. This is a psychological model that explores communication while feeling the gap in perception.

Johari's Window is trick-taking game based on this psychological term and have four types of hands: open (public hand), hidden (hidden hand), blind (hidden only to you), and unknown (hidden to all). The objective is to match the number of tricks with other players, and you first make a bid as to who you want to match.