The Castle, a grand moving machine that has way too many rooms. The residents are the Players, teenagers thrown into a game of life and death without explanation, memories, and a desire to escape. And their grand warden? A mysterious figure only known as 4 (or Four), whose masked face betrays no surprises, plot twists, or previous knowledge. Our main characters on the Castle side of things are Left Knight, Left Bishop, Right Rook, and White Queen. Main antagonists are 4/Four, White King, and to a lesser extent, the creatures they fight. Minor characters that play some role include Right Knight, First, Fifth, and Right Bishop.