Seems like this is the one where they've settled on all of the core puzzle types that persist throughout the rest of Picross e, so I'm thinking this may end up being the pinnacle. I glanced through the rest of Picross e and they don't seem to add anything new throughout. This one doesn't technically add anything new, but it collects everything the series has done so far and puts it all together in one excellent package. I've also now changed my mind about Mega Picross!