From the back of the box:

QUADULAR...The Prince shall be Crowned

In July, 1986, Mr. George Koltanowski, INTERNATIONAL CHESS MASTER and BLINDFOLD CHESS CHAMPION endorsed Quadular: Among his many remarks are: "One thing for sure, QUADULAR will make you think." "People of all ages can play and enjoy QUADULAR.

This game offers an entirely new concept in strategy. It's exciting, yet thought provoking.

Introducing the Prince: A newly conceived and designed playing piece that lends more majesty to the game. The Prince must make his way into another Domain in order to receive his Crown. Once Crowned, his strength multiplies and the course of play can change drastically. Should the Crowned Prince survive, he can become the new Ruler of his Domain.

QUADULAR The mind-stimulating game of the future

Contents: 1 Gameboard
Rules
4 sets of playing pieces (5 pawns, 2 rooks, 2 knights, 2 bishops, 1 queen, 1 king, 1 prince, 1 prince's crown....per set).

(c) 1987 HPH DEVELOPMENT, INC STOCK NO. HP 102