New puzzles in"Extra" mode have been included as a freebie along with four other Picross modes: Picross, Mega Picross, Color Picross, and Clip Picross!

There are 300 Picross and Mega Picross puzzles, 150 Clip Picross piece puzzles, 30 Color Picross puzzles, and 5 Extra puzzles, a grand total of 485 puzzles!
Link play data from Picross S, Picross S2, and Picross S3 to unlock three Extra puzzles.

From this title onwards, units of 10 squares on the Count Grid are highlighted in different colors on the Extra Puzzles screen for large Picross puzzles.

Picross is a picture crossword puzzle game where you follow hint number to complete a picture.
With simple, easy-to-follow rules, it's a game anyone can play!

More details on the official game page of PICROSS S6 ...