Step 1: click the big tiles to make them fill in a certain shape. Step 2: click the Generate button. This will have the four smaller grids fill seemingly randomly. If these four were layered on top each other, if there are an odd number filled, the tile is filled. If there are an even number, the number filled is blank. Step 3: copy your encrypted picture by drawing it or some other way. If you are unhappy with the result, click Generate again to have different formats of these tiles. Step 4: If you want to customize your grid shape, change the length and height variables (1-9), and then press RESET.
