A Dark Synchro Summon is a method of Summoning a Dark Synchro Monster. Both the Summon method and the monster category exist only in the anime and in the later members of the Tag Force series of video games. Its mechanics are somewhat the antithesis of a Synchro Summon, as instead of requiring a Tuner monster whose Level is added to the Level(s) of a non-Tuner monster(s) to equal the Synchro Monster's Level, it requires a Dark Tuner monster whose Level is subtracted from the Level of a non-Tuner monster to equal the Dark Synchro Monster's Negative Level. Therefore, in order to Summon a strong Dark Synchro Monster with a high Negative Level, the Dark Tuner must generally have a very high (positive) Level and the non-Tuner a very low Level, barring the activation of cards such as "Dark Wave"