Resign all the save files using save wizard and then load up save file 3 in the game. Follow the YouTube guide to find Patricks last sock. This will get you Sock Opera trophy, then give Patrick his last sock and he will give you the last golden spatula unlocking Super Ultra Mega Spatula Seeker trophy. Depending on what trophies you haven't got, you might unlock more.
Go to - 2:18 - BIKINI BOTTOM - SOCK #8 for the last sock
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This game should be easy to platinum with this save.