Nonogram also called Picross or Griddlers
The numbers say how many squares in a row are filled, in order. Work out which squares they are, row by row and column by column, and a picture appears. Every puzzle can be solved by logic alone — no guessing.
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Puzzle
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Drag to fill a whole stretch. Right click (or ✕) marks a square you know is empty. On a phone, two fingers zoom and move the board.