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.