Strong Dojo, known as Gongenzaka Dojo (権（ごん）現（げん）坂（ざか） 道（どう）場（じょう） Gongenzaka Dōjō) in the Japanese version, is a preparatory Duel school focusing on "Non-Action" or "Heavystrong" Duel and is located in Paradise City. Its owner is Mr. Strong.