Knight's Tour version 2.1 - Instructions
This program is in the public domain.

Overview

The Knight's Tour is a simple game of skill.  The object of the game is to
move a knight (one of the playing pieces in a chess game) on a chessboard 
such that every square on the board is covered once and only once.  It's not
as easy as it might sound.  There are multiple solutions to the Knight's
Tour; however, after trying and failing to cover every square a few times,
you may have a hard time believing it!  Once you succeed in covering the
board completely (and assuming you didn't just get lucky), repeating the
Knight's Tour is somewhat easier than it was the first time.

The movement of a knight on a chessboard is somewhat unusual.  A knight may
move two squares in one direction (horizontally or vertically) and one
square in a perpendicular direction, for each move.  The knight thus moves
in a kind of L-shaped figure.  For example, it may move two squares to the
right horizontally, and one square down, or one square to the left and two
squares up, etc.  If you are not sure how the knight moves, select "Show
valid moves" from the Display menu of the game, and all valid moves at any
given point in the game will be marked by a green marker (in the case of the
first move, all the squares on the board are valid moves, since you can
start on any square you wish).

Playing the Game

The cursor becomes a knight whenever it is on the chessboard.  You move by
moving the cursor to the square to which you wish to move your knight, and
clicking the mouse on that square.  At the beginning of the game, you can
put your knight anywhere you wish on the board; thereafter, each additional
move must be legal for a knight (one horizontally and two vertically, or
vice versa).  The program will not let you cheat.

Squares you have not yet covered are gray or black, and they are marked by
a green marker if you can move to them and you have turned on the Display
valid moves option.  Squares you have already covered are light or dark 
red, and they are numbered in the order you covered them if you have 
turned on the Number moves option.

You can take back moves by pressing the right mouse button.  You can back up
as far as you want--to the beginning of the game, if you wish.

If you get stuck with no valid moves remaining, and you haven't covered
every square on the board, the program will tell you so, and give you the
opportunity to start a new game or continue (select "Continue" if you want
to take back moves and keep trying).

Menus

Game menu

 --  New game       Starts a new game and clears the board

 --  Cancel move    Cancels your most recent move and restores the square
                    to which you last moved.  This option is disabled if
                    you haven't yet moved at the start of a game.

Display menu

 --  Number moves   Marks each move you have made with a number in
                    ascending sequence.  If you win, these numbers allow
                    you to figure out how you won!  Initially this option
                    is turned off.

 --  Show valid moves   Marks all the valid moves with a green marker.  If
                    you are just starting the game, all the squares are
                    marked (because you can start the Tour anywhere you
                    want on the board).  This option is initially turned
                    off.

? menu

 --  About Knight's Tour...   Prints the current version of Knight's Tour. 

Required Configuration

This program requires at least a PC with a 386 microprocessor or better,
Windows 3.1 or better, and a VGA.  It might work on more modest configura-
tions, but it's never been tested on anything smaller.

Miscellaneous

The game is certainly nothing like chess, but it's harder than it looks.
How long it holds your interest probably depends on how long it takes you
to consistently win the game!