The most common way to play "Gadget" archetype is to use it with "Machina" cards. A Machina Gadget deck focuses on bringing out "Machina Fortress" on to the field, generating a constant stream of Gadget monsters through "Red", "Green" and "Yellow Gadget" and maintaining advantage over the opponent. With the advent of "Gold Gadget and Silver Gadget, the player can get another "Gadget" monster on to the field more quickly.
Main Deck monsters
The most important monsters of the Deck is obviously the colored "Gadgets" since they can fill up your hand with another Level 4 "Gadget" and swarm the field.
Some monsters that helps swarming further include:
"Missus Radiant" can help boost the ATK of "Machina" monsters as well as add 1 EARTH monster from the GY to your hand. "Proxy Dragon" helps protect a card you control from destruction by destroying a card it points to instead. "Trigate Wizard" offers double battle damage and protection from effects, as well as removal of a potentially dangerous card.