Doraemon Specials (1970) : 3x11

Nobita dreams of celebrating Doraemon’s birthday at a spectacular “Airship Amusement Park,” but is scolded for not finishing his homework—until a head-poke device briefly turns him into a genius who draws the park’s blueprints. A year later Connie, the 22nd-century designer, builds the airship and brings it to the present; Nobita, Doraemon, Shizuka, Gian and Suneo ride it. Jester, head of rival Jester Land, plots a takeover, but the ship needs Nobita’s secret passcode to control it; after chaos from Jester’s clones and a dangerous hill, the plan is aborted. Doraemon suspects the code is 0209 (or 0902 — his birthday), the friends escape unharmed, and the party ends safely.