The How to Fish Spider Crab boss seems terrifying at first due to its size and ability to utterly eviscerate you with its claws. However, defeating this beer-stealing crab isn’t that difficult once you have the right weapon and know it's vulnerable to attacks. I've explained all of that below so that you can easily beat the Spider Crab boss in How to Fish and finally sail to the next island.
How to Fish Spider Crab boss tips
To kill the Spider Crab, you ideally need a fully upgraded knife since it's the most powerful weapon you can get on the first island – using the knuckledusters or even your fists to beat the Spider Crab to death is possible but not advised unless you're playing with other people and can all attack the crab at once.
Buy the knife for $45 dollars, then pay to upgrade it using the anvil three times, which costs an additional $78 in total. Keep fishing using the hot dog bait and selling clams to efficiently gather enough cash. With a nice and sharp knife, reel in the Spider Crab using an empty beer can as bait.
The knife will deal good damage to the Spider Crab, but you also need to attack at the right time to avoid dying. The crab's main way of attacking is charging in a straight line towards you, so get out of the way and then start stabbing it as soon as stars appear over its head, indicating it is stunned. As soon as the crab recovers and starts to turn, run away again to avoid getting snipped then wait for it to charge again.
Rinse and repeat until the Spider Crab is dead. It will then violently explode, letting you grab and sell the meat and Spider Crab Shell by feeding them to the lighthouse keeper. He'll give you the keys to his boat in return, letting you leave the island, but you must also buy the radar tablet next to him for 10 bucks so that you know where to go next.
You'll have to collect How to Fish Leeches to get the right bait for the boss on the second island, the How to Fish Giant Piranha!
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