Dark Tuner monsters (known as "Minus Tuner Monsters" in the manga) are a monster type that made its debut in Yu-Gi-Oh! 5D's in episode 27. Dark Synchro Monsters are Synchro Summoned by sending to the Graveyard 1 Dark Tuner monster and 1 non-Dark Tuner monster. The Dark Tuner monster's Level minus the non-Dark Tuner monster's Level must be equal to the Dark Synchro Monster's Level. Currently, there are no Dark Tuner monsters in the OCG or TCG, they only exist in the anime/manga and are playable in Yu-Gi-Oh! 5D's Tag Force 4, Yu-Gi-Oh! 5D's Tag Force 5 and Yu-Gi-Oh! 5D's Tag Force 6.