Aikin's detailed treatment of the rules for Chesseract can be found on the Chess Variant Pages (http://www.chessvariants.com/large.dir/contest/chesseract.html).

The board is a four-dimensional cube (a tesseract -- get it?) measuring four cells on a side.

Most of the pieces are familiar from Chess, and behave analogously. The King has been deprived of his diagonal move, and the rook has gained the ability to turn the corner when it encounters an edge of the board.

The Unicorn moves like a Knight, but takes an extra step in a direction perpendicular to the first two. The Wizard moves more diagonally than the Bishop, and the Minstrel is a peaceful being who moves as the Rook and prevents adjacent enemies from capturing.

The author describes the game as "virtually unplayable", owing to the difficulty in visualizing the moves for all the pieces; but Zillions makes it easy!

The game fits in an 800x600 desktop, just barely, if the toolbar and such are turned off.

You should extract the downloaded zip file preserving path names.