You'll have to fight Poseidome after opening the 15 Golden Spatula Gate in Bikini Bottom.
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Played on PC:
Intel i5-7600 CPU @ 3.5Ghz
GeForce GTX 1070
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Spongebob Squarepants Battle For Bikini Bottom Rehydrated Game Guide: /playlist/PL_l3PEDN9zYhgV0F3uj4cEu69U48zXcPZ