I have the main unit.
type game console
The Nintendo Game & Watch Octopus — Diving for Treasure
The Nintendo Game & Watch Octopus, released in July 1981, featured a diver collecting treasure from the ocean floor while avoiding the tentacles of a giant octopus — one of the most distinctive and charming scenarios in the Game & Watch series. The diver must time movements carefully to pass between the octopus’s swinging tentacles, collect treasure from the seabed, and return safely to the surface before the tentacles sweep back. Octopus’s underwater theme and memorable antagonist made it one of the most visually distinctive Game & Watch titles, and it remains a beloved model among collectors who appreciate the series’ variety of imaginative gameplay scenarios.