"Gadget" (ガジェット Gajetto) is an archetype of Machinemonsters (with the exception of the Cyberse "Cyberse Gadget" and "Gadget Token").
The primary "Gadget" monsters and their support focus on generic Machine support, fast Summoning and swarming, and are centred around the cards "Green Gadget", "Red Gadget", and "Yellow Gadget", used by Yugi Muto. These Gadgets also synergise strongly with the "Ancient Gear" archetype, due to several members of the latter archetype directly supporting the colored Gadgets or Gadgets in general. There is also a smaller group of "Gadget" monsters that support the "Morphtronic" archetype, and are used by Leo in the anime, as well as a few others which do not belong to either group.