Oh color picross sounds cool. Thank you, I'll check out s3 thenAll the games have Mega puzzles so you may be out of luck there.
They're all pretty similar really, but a few extra bells and whistles are added on as the series goes on. S2 added Clip Picross mode (smaller puzzles that make up bits of of a bigger picture), S3 introduced colour picross and giant picross came along in S4 but they're all pretty similar overall.