Have played 2D versions on iPhone and DS Picross lot. The problem with the 2D DS game was the one most ancient Scores can not erase. (I at least never figured out how). Games now three weeks nonstop on Picross 3D and am not even through the simple puzzles, because there are so many simply.
Little Extra. You can even create their own puzzles and share them with friends.
Made very great. Who is a fan of Picross games, can access courageously here.