Source: https://www.reddit.com/r/speedrun/comments/i9zzgy/a_consistent_setup_to_preform_the_pirate_ship/ A little context here:
As I mentioned in the video, I found a consistent way to clip through a particular wall in the Pirate Ship level. Here are the step:
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Run head-on to the small ledge until there's a smoke coming out from Puss's feet but he isn't moving forward.
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Perform the block (R trigger) and turn around about 90° to the right.
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Walk forward and perform the block such that Puss's left paw touches the right side of the third screw from the left as shown in the video.
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Perform the parry jump (R trigger + X) and ground pound (X button + Circle button) once you touch the curved wall.
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Still in block mode, turn Puss so he faces to the camera and perform another parry jump.
If done correctly, it should clip Puss through the wall far more consistent, save about 2 to 3 minutes by skipping the lever to pull down the wall and its associate cutscene.