How to Get the Halibut Harpoon

Harpoon a Fish guide · Updated

Short answer

Enter Dr. Monty's lab through the giant bubble window, answer his quiz correctly, and complete both extensive pufferfish collection tasks.

How do you complete Dr. Monty's questline to get the Halibut Harpoon?

  1. Find Dr. Monty's lab through the window inside the giant air bubble area and answer his quiz with the correct answers: Hubert Mission, 13.3 million, and orange.
  2. Collect all required standard pufferfish types including regular, flying, flute, blight, pyrite, carrot, and mustard pufferfish.
  3. Prepare for the second rigorous quest stage requiring specific mutations like forest spirit, mossy, and putrid, plus multiple perfect catches.
  4. Grind 500 perfect catches using the Halibut Harpoon and purchase carrot sticks for preferred luck to speed up the process.

Watch: How to Get the Halibut Harpoon

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Sources: Carbon Meister Plays. Summarized from YouTube videos and player comments; credit goes to the creators.