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* This card's Number comes from its owner, [[Quattro]], whose name is the Roman numeral Numeral for 4.** Furthermore, this is the fourth Number monster owned by the Vetrix Family and the fourth Number to belong in an existing [[archetype]]. * This is the second "[[Gimmick Puppet]]" "Number". The first is "[[Number 15: Gimmick Puppet Giant Grinder]]".** This card is likely the offensive counterpart to "Giant Grinder". Its [[ATK]] and [[DEF]] is the inverse of those of "Giant Grinder" plus 500. ** Also it can [[destroy]] monsters after battle and then inflict [[effect damage|damage]] during the opponent's turn, while "Giant Grinder" can activates its effect to inflict damage before battle during the owner's turn.
* This card's second effect is the second similar to "[[Gimmick PuppetSpeed Spell - The End of Storm]]" "Number". The first is and "[[Number 15: Gimmick Puppet Giant GrinderWinged Kuriboh LV10]]".
* This card resembles "Number 15: Gimmick Puppet Giant Grinder" in a certain way: Both reveal themselves having hollow chests without hearts in them. "Number 15" has grinders instead, and "Number 40" has strings in the left part of his chest where its heart should be.
* As with most other [[Xyz Monster]]s with them, when this monster absorbs an [[Xyz Material|Overlay Unit]], it absorbs it through its sword.
* When this monster activates its effect, it plays the strings on its chest with its sword like a harp, then red, glowing puppet strings come down from a portal and attach themselves to every other monster on the field.
* This is the first "Number" monster where the "Number" printed during its [[Summon]]ing in the anime and the Number on its body are not the same color. When it is printed during its Summon, the Number is a plum color, but on the monster itself, the Number is red. This might be an animation error.
* This is the second "Number" monster that requires a specific [[Attribute]] for its [[Xyz Summon]]. The first is "[[Number 96: Dark Mist]]", though in both cases, this only applies to the anime versions.
* The number 40 can be seen on the top of this monster's wing.
** This makes this card one of 3 "Number" monsters whose Number appears twice in its artwork, which include "Number 15: Gimmick Puppet Giant Grinder", "[[Number 6: Chronomaly Atlandis]]".
* This card is the first [[Xyz Monster]] to use [[counter]]s of any kind.
* This card's effect shown in the anime is very similar of the "requiem for strings" technique from Benetnasch Eta Mime from the Saint Seiya Asgard arc.
** Both play a harp and strings attach to the opponent strangling them during the music.
