Start:
In progress:
Finish:
“Known as griddlers, hanjie, nonogram, picross, kare karalamaca, japanese crossword, cryptopics or pic-a-pix. The goal of griddlers is to find out the positions of black or colored blocks using number hints in the white grid.” Griddlers Plus
Advanced rules to go beyond single line solving: Griddlers Tutorial.
Cool!
Yes. Also time sink.