## Description

_Su Doku_ is a Sudoku variant.
The rules: The game is played with nine grids. Each grid contains nine squares
arranged in a 3 x 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.

The game screen has two main areas. On the right is a red 3 x 3 grid holding
the numbers 1-9. On the left is the Sudoku grid. The player examines the
Sudoku grid and decides that, say, a number 3 belongs in a particular square
on the main grid. Then, using the mouse, the player clicks on the number 3 in
the left hand grid and drags it to the desired location on the Sudoku grid. If
the ‘Indicate Illegal moves’ option is turned on the squares beneath the
number being moved will change colour to either red or green, red meaning that
the placing the number there would be an illegal move, and green meaning that
such a move would be legal. While this is a help it is not a cheat as such
because there may be multiple places in the grid which are legal moves. If the
‘Indicate Illegal moves’ option is disabled all squares over which the number
being moved passes turn yellow.

This game features over 10,000 puzzles, three difficulty levels, hint and next
move functions for beginners, a save feature, and a print function so the
player can solve the puzzles without a computer.

The game also features a ‘boss key’ which instantly minimises the game, but
keeps it running. This is intended for those players who play the game at work
in quiet moments and whose boss may make unexpected visits.

Su Doku