A video game adaptation of a mathematical picture-drawing puzzle that plays like if Picross took a few steps toward Minesweeper.

As with Picross, you have a rectangular grid where some squares are meant to be colored in to reveal a picture. Unlike Picross, here the clues are numbers from zero to nine found in some of the squares, indicating how many of the immediately-surrounding squares (plus the clue square itself) should be filled in. A nine means to fill in the entire three-by-three section, while a zero means all of those squares are blank instead. By starting with the zeroes and nines (or sixes along the grid’s edge, or fours in its corners) and spreading to adjacent clues (a three next to a nine, for example, means the remaining six squares in the three’s area should be blank) you gradually fill in or blank out every square in the grid and reveal the image.