The Octopus is the boss of the Turtle Zone. The battle takes place entirely underwater. The Octopus will move around the screen, occasionally shooting ink blobs that obscure your vision or trying to grab Mario with its tentacles. To defeat it, you need to jump on its head three times.

Strategy:
- Avoid Ink Blobs: The ink blobs temporarily darken the screen, making it harder to see. Try to dodge them.
- Dodge Tentacles: The Octopus will extend its tentacles to try and hit Mario. Swim away quickly to avoid them.
- Timing the Stomp: The Octopus will occasionally lower its head, making it vulnerable. Swim above it and press A to stomp on its head.
- Power-up Advantage: The Superball Flower is incredibly effective here. You can hit the Octopus with Superballs from a distance, even when it's not fully exposed, making the fight much safer. Three Superball hits will defeat it.
After three successful hits, the Octopus will be defeated, and you'll claim the sixth and final Golden Coin!