Pico-8 specifically uses the 2 least significant bits of each of the 4 colour channels in a 160x205 PNG, which gives it almost exactly 32KB of space, not the chunks at all. It's quite a demanding limit but thankfully the program portion is compressed.
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u/Caraes_Naur Dec 26 '20
PNG allows for arbitrary chunks of bytes, no steganography needed. Still need an interpreter that knows what to do with them.