## Description

_Sudoku_ is a single player puzzle game. The game is played with nine grids.
Each grid contains nine squares arranged in a 3×3 formation as are the nine
grids themselves. The program fills numbers into some grids and the player has
to put the right number into all the remaining squares. In every square,
vertical row and horizontal row every number of 1-9 has to be there exactly
one time. Though numbers are used they are purely used as symbols, the game
requires logic, not maths, skills to complete.

This game has 1,000 puzzles grouped into three difficulty settings, puzzles
1-334 are easy puzzles. 335-667 are medium difficulty puzzles and 668-1000 are
classed as hard. When a puzzle has been completed it is marked with a tick,
one that is in progress is marked with a circle. Games that are part completed
can either be restarted or resumed.

The game area consists of a single 9×9 grid. Below the grid are the numbers
1-9 which the player selects with the mouse. The player selects a cell within
the grid, and then selects the number they wish to place in it. Numbers can be
entered in two ways, in pen or in pencil, which mimic the way the puzzles are
played on paper.

This game features hint and cheat functions, duplicate number warning function
and a ‘dim entered numbers’ function which effectively highlights the valid
numbers for a given cell.

Sudoku ++