Quadrature (1992)

Played on an 11 by 11 board. If you form a rectangle with 3 of your pieces and one of your opponents pieces, your opponent's piece is converted into one of yours.

1993 Mensa Select

Online Play

• Super Duper Games

Played on a Go style board, From a prescribed starting position on the periphery, players take turns to move pieces forwards and sideways but not backwards, to try to form rectangles. If you create a rectangle in which three corners have your pieces and one has your opponent's, you replace his piece with one of yours. To win, you must eliminate all but two of your opponent's pieces.