A pioneer in the movement towards plotting cryptic design in Japanese platformers. Atlantis no Nazo is renowned for its "difficulty" -- the result of stiff control, obtuse progression, and limited offensive / defensive options.
At the same time, it's also a genuine genre innovator: Spanning a hundred stages, providing multiple dozens of different paths, featuring an expansive inventory, and generally pushing the platform (and players) to their limits. An essential entry in the Famicom canon.