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'''Tuner monsters''' (Japanese: チューナー ''Chūnā'' , "Tuner") are [[Monster Card|monsters]] with "Tuner" listed on the [[Type]]/[[Ability]] line. They are required for the [[Synchro Summon]] of a [[Synchro Monster]]. [[Normal Monster|Normal]], [[Effect Monster|Effect]], [[Pendulum Monster|Pendulum]], and Synchro Monsters themselves can all be Tuner monsters, although some [[card effect]]s can [[Treats monsters as Tuner monsters|treat other non-Tuner monsters as Tuners]]. [[Flip monster|Flip]] and [[Union monster]]s and [[Special Summon Monster]]s can also be Tuner monsters.

To perform a Synchro Summon, the player [[send]]s monsters they [[control]] (including exactly 1 Tuner monster) to the [[Graveyard]] whose total [[Level]] is exactly equal to that of a Synchro Monster in their Extra Deck (including at least 1 Tuner monster), then they Synchro Summon that Synchro Monster. Rarely, Synchro Monsters may allow or [[Double Tuning|require]] the player to break the exactly-one-Tuner requirement.

There are a few A number of [[support ]] cards that specifically deal with Tuner monsters, including "[[Mind Trust]]", "[[Boost Warrior]]" and "[[Quillbolt Hedgehog]]", which can further aid in setting up a Synchro Summon.

Some Synchro Monsters require a specific Tuner monster to be Summoned used ("[[Sun Dragon Inti]]"), or a Tuner of a specific [[Type ]] ("[[Trident Dragion]]"), [[Attribute ]] ("[[Dragocytos Corrupted Nethersoul Dragon]]") , or [[Archetypearchetype]] ("[[Blackwing Tamer - Obsidian Hawk Joe]]"). Likewise, some Tuners can only be used only for the Summon of a limited range set of Synchro Monsters, such as "[[Brotherhood of the Fire Fist - Spirit]]", "[[Mystic Macrocarpa Seed]]" , and "[[Scrap Soldier]]".

There are also [[Tuner Synchro Monster]]s, Synchro Monsters that are themselves Tuners. They Due to their difficulty of use, they tend to have effects that make Synchro Summoning easier, either such as by manipulating their own Level ("[[Phonon Pulse Dragon]]"), allowing its [[control]]ler to Synchro Summon during the opponent's turn ("[[T.G. Wonder Magician]]"), or have having effects that activate when used as a Synchro Material ("[[Puralis, the Purple Pyrotile]]"). They In the anime, Tuner Synchro Monsters are also notably required for [[Accel Synchro Monster]]s, such as "[[{{anime|Shooting Star Dragon]]}}".

Tuner monsters are often low in Level, usually ranging from Level 1 to 3; there are a considerable . A number of Level 4 Tuner monsters exist, but very frequently have [[negative effect]]s or [[condition]]s that limit their use (due to Level 4 being by far the most common Level for usual monsters, this is presumably to make it more difficult to Summon the signature Level 8 Synchro Monsters). Tuner monsters that are Level 4—but they are generally very specific 5 or situational—and very few that higher are significantly rarer. The first Level 5 4 [[Normal Monster|Normal]] Tuner monster, "[[Angel Trumpeter]]", was not released until 2016, eight years after the debut of Tuner and aboveSynchro monsters.

Many Tuner monsters have effects that assist in performing a Synchro Summon, either such as by Special Summoning another monster ("[[Deep-Sea Diva]]", "[[Masked Chameleon]]"), Special Summoning themselves when a condition is met ("[[Lady of the Lake]]", "[[Fishborg Archer]]") , or managing the Level, Type , or [[Attribute]] of monsters ("[[Delta Flyer]]", "[[Genomix Fighter]]", and "[[Genex Ally Chemistrer]]", respectively); . One monster, "[[Phantom King Hydride]]" , can even become treat itself as a non-Tuner monster for a Synchro Summon.

Some Tuner monsters, as As implied by their the name, several Tuner monsters and their designs have ties to sound, like "[[Frequency Magician]]", "Phonon Pulse Dragon", and the "[[Resonator]]" monsters. As such, most Many Tuner support cards have references to music or wavelengths, like "[[Natural Tune]]", "[[Resonator Call]]" , and "[[Tuning]]".