The How to Fish Pufferfish is a surprisingly tough boss that you need to beat to get to the game's fourth island. It starts small and agile but eventually balloons in size to become horrifyingly large and fatally toxic, capable of killing you very quickly. It's a substantial step up in difficulty from the How to Fish Piranha boss, so I don't blame you for wanting some pointers for defeating this powerful pufferfish.
The best method for killing the Pufferfish in How to Fish is to start by strafing backwards in small circles, shooting at the Pufferfish with a fully upgraded SMG. As with the How to Fish Shark miniboss that you can fight on this island, an SMG with an extended mag, compensator, and all the bullet upgrades is arguably the best option, though the shotgun is also a good choice given that the Pufferfish is almost always very close to you.
Strafing backwards in circles is also a bit awkward, but is a great way to keep out of the Pufferfish's way without it being able to properly catch up to you. It's a very fast fish when it rolls in a straight line, but is much slower when it must constantly turn. Also bear in mind that the Pufferfish expands the more you shoot it, so it'll get bigger and a bit less agile the longer the fight goes on.
Fill it with enough bullets to get it to half-health, and it'll start a second phase in which it starts spewing lingering poisonous purple clouds .
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