These are all the currently known skips to get to Blue Lake in Hollow Knight. If I missed any, let me know in the comments below!

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https://tinyurl.com/s6bs3ba8

Quick disclaimer: Blair wants everyone to know that he DID NOT discover permafloat. He doesn't take credit for this discovery whatsoever and the glitch dates back all the way to Hollow Knight original release. It is unknown who actually discovered this glitch