McDonald's Treasure Land Adventure (SEGA, Treasure) undiscovered Easter Egg

Recently someone pointed out to possible existing Easter Eggs inside this game
there is no definitely sega logo explosion easter inside as soon as i see, but found a full fledged 3d engine along with models to see. all rendered in real time, exactly as stated by Maegawa in the most recent issue of Retro Gamer "if you enter a secret password the password entry screen itself turns into a polygonal display." Not only the password needed, but the button combination to be held in order to trigger this Easter. More details will follow on Twitter ;)