The object of this Sudoku game is to place the colours in each cell of a 9x9 grid made up of 3x3 subgrids (called 'regions'), starting with various images given in some cells (the 'givens' or 'seeds'), each row, column, and region must contain only one instance of each colour. Some of the cells already have colours inserted to help you. You enter a colour into a cell by using the colour ball wheel on the screen. The top colour on the wheel is the one that is selected. Use the arrow buttons or your arrow keys to move the colours around until the one you want is at the top. Then click on a cell to insert the selected colour. Click on the Erase button to remove the colour or use the wheel to replace a number. To help you, you can click on the small button in the bottom right corner of every cell to turn on the lines feature. This shows horizontal and vertical lines so that you can see if you don't need a colour in a row or column. Have fun!