Grid Picture Puzzles. A grid puzzle is any type of puzzle that takes place on a grid. You have a grid of squares, which must be either filled in black or marked with x.
The object is to reveal a hidden picture by painting blocks in each.
The challenge is to locate the place where each group of pixels belongs and accurately fill in the grid with. The grid could be rectangular like with a sudoku or crossword puzzle, or it could be a hexagonal grid or any other sort of shape. You have a grid of squares, which must be either filled in black or marked with x. It's not uncommon for someone to want to make a photo grid to add a personal touch to their online.