Series. Mega puzzles use the same puzzles as normal, just with different clues. Take a long break before doing those so you won't remember the answers.
Picross e
Series. Very polished for a quick puzzling experience.
Picross 3D: Round 2
Picross 3D
Pepper's Puzzles
Paint it Back
Murder by Numbers
Visual novel hybrid. Only recommended if you like the story. There's no pure puzzle mode.
Meow Tower: Nonogram
Legendary Mosaics: The Dwarf and the Terrible Cat
Series - Super cheap when on sale. Colored puzzles. Has choosable difficulties