Give Up the Ghost: a puzzle checklist

Okay I don’t mean to spam this thread but I got up to puzzle 47 and pushing a portal into a portal and having it literally explode me was such an unexpected twist that I nearly burst out laughing. I have no idea if it is a necessary technique one of the last few puzzles will take advantage of or just a wonderful little easter egg but it left me with a big stupid grin on my face for the next minute or so.

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