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So here you go: this is my favorite online Nonogram site, here are a bunch more.
It can be used to solve a particular type of puzzle called a nonogram or logigrams.
Edel エデル (Paint by Numbers, Nonogram, Griddler)
This was a reference to the fact that, when the nonogram was complete, the letters inside the picture (a heart, of course) spelled out: ARTTWOTEN.