In this game, board positions are occupied randomly by the letters A to P.
The object of the game is to order the letters by rotating any four letters
clockwise one position. You click the upper left position of the four you
wish to rotate.
You also get one 'special' move per game which you may or may not need. The
special move allows you to exchange any two adjacent letters in a row. To
make this move, click the 'Exchange' button next to the board. Remember --
only one special move per game!
The original BASIC program was written by
David H. Ahl and
published in
More BASIC Computer Games (New York, Workman 1980). This Javascript adaptation
(using the
MooTools framework) was written by
Demian Katz with the author's permission.
If you're interested, see conversion design notes
here.