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"Firewall" (ファイアウォール Faiawōru) is a series of Cyberse monsters used by Yusaku Fujiki (Playmaker) in Yu-Gi-Oh! VRAINS. With the exception of "Firewall Guardian", all of its members are Extra Deck monsters. They are also all DARK monsters, except for the LIGHT "Firewall Dragon".
Each member resembles a dragon-like cybernetic being.
The series is named after a firewall in computing.