Fill-a-Pix

Fill-a-Pix (FAP, Mosaic, Nurie, Nampre, Count and Darken) is a logic puzzle. Blacken some cells in the grid, with some cells having a given number of black cells in the 3×3 square around them.

Rules: Colour the neutral cells in the grid either black or white. Each number indicates how many cells should be blackened around the cell with the number, including the cell itself.
Solving the puzzle reveals a hidden picture.