Mosaic is a game where you have a puzzle on a board and you're missing one piece. You have to slide the pieces so that they fit in the right order. You can play with numbers so that you have to organize them in numerical order, or you can use a picture. If you try to solve a picture puzzle, you have to organize the pieces in the right order so you can see the picture. For example, a building could be mixed up and you have to rearrange the pieces so that they look like a building again. For numbers, on the first row, you would have 1, 2, and 3. On the second row, you would have 4, 5, and 6. on the 3rd row, you would have 7, 8, 9. You can also change the grid size to use more numbers or make the picture pieces smaller.