A Shadow Game (闇のゲーム Yami no Gēmu, literally Game of Darkness or Dark Game) is a contest in the Yu-Gi-Oh! series generally between two people that involves a harsh Penalty Game for the loser. Shadow Games are predominately mentioned in the original Yu-Gi-Oh! manga. Shadow Duels, which are Shadow Games of Duel Monsters, are also played in Yu-Gi-Oh! GX, Yu-Gi-Oh! 5D's, and Yu-Gi-Oh! ZEXAL, though not all Shadow Duels are Shadow Games as they are seen in the original anime.