For years Sudoku’s were very popular and we still see them here and there. A comparable type of puzzle is the nonogram, a type of image puzzle that was mainly known under the name Picross. Armor Picross is a nice online variant of this genre. In a nonogram there are numbers next to and above a grid with squares. These indicate how many squares in the grid should be colored in, possibly in several groups. Just like with Sudoku, you use the available clues to complete the field, this time not with numbers but with blocks. This creates a drawing or icon.
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Picross – Make pictures of numbers