The ravens of thri sahashri is a two player cooperative card game one player is playing the girl ren who has lost her memory the other is the detective trying to repair it the game is about trying to communicate as well as possible by simply the choice of cards note quotthri sahashriquot is the buddhist term for a trillion worlds combined which in this case means quotthe other planequot of a deck consisting of cards of five colors and numbered 1ndash5 the ren player draws four