Picross is a nanogram game, well known as video game though Nintendo.
Nonograms, also known as Hanjie or Griddlers,
are picture logic puzzles in which cells in a grid must be colored or left
blank according to numbers at the side of the grid to reveal a hidden picture.
In this puzzle type, the numbers are a form of discrete tomography
that measures how many unbroken lines of filled-in squares
there are in any given row or column. For example, a clue of
“4 8 3” would mean there are sets of four, eight, and three filled squares,
in that order, with at least one blank square between successive groups.