Sudoku is a logic puzzle played on a 9 x 9 square grid that is also viewed nine 3 x 3 regions. The usual layout of the grid is illustrated below. The puzzle starts with some cells filled in. The objective is to fill in the remaining cells so that each row, each column, and each of the outlined 3 x 3 blocks contain a permutation of the numbers 1 through 9. A more detailed description of the puzzle can be found in the Wikipedia article on Sudoku. A Google search will provide many additional links on the subject.
You are not required to provide a solution for the Sodoku game, or even know how to play Sudoku to do this assignment. You only need to understand the basic rules as described above, and provide a prototype that enables input and result checking.
You can implement the prototype system using your preferred design style and development approach as far as it fulfils the essential requirements as follows:
A table-less three column style layout using CSS; (Bonus point: choose and apply a CSS grid framework in your design)
Here is an example to develop your demonstration web pages. The homepage features a table-less three-column style with a top header, a left, a central, a right column, and a footer with:-
The header shows the overall title of the project.
The footer shows the current date and time and last modified information etc.
The left column contains a listed menu to give the user a choice of three difficulty levels: easy, medium, and hard. (A typical set of puzzle and solution is provided below)
The right column contains a list of buttons to enable switching between different styles for different types of users, e.g. big font, high contrast, etc.
The central column shows a 9x9 grid for the Sudoku game. When a selection is made on the left column, a puzzle (i.e. the initial configuration) as well as a solution will be loaded into memory. When the user left clicks in a cell, the cell is "selected." If the user types a digit 1 through 9, the digit is written into the cell. If the user types a 0 the cell is erased. There is to be a "Check" button that will report whether the number entered in the selected cell is the correct value for the solution. Present an alert window with a message indication whether it is correct or not. A "Reset" button reloads the initial configuration for the selected puzzle.
Puzzles and solutions: The data for a puzzle is a text string consisting of two lines of 81 digits each. The first line is the initial configuration with a zero indicating an empty cell. The second line contains the solution. The following codes are to be used in your program. (Note: you are not asked to solve the puzzle in your program)
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