Instructions: Click and reclick to move four 'cards' to the discard row, under the horizontal line.

For the remaining 9 cards, arrange them so that the cards in each row, column, and diagonals have a symbol in common.

TO DO LIST

Discard four cards which share a symbol.

Use one of your discarded cards to guide your choice of symbols. Create three rows of cards where each row has a common symbol which is on your guide card.

Use another one of your discarded cards to guide your choice of symbols. Create three columns of cards where each column has a common symbol. Only move cards within the same row.

Enjoy the fact that the other two parallel families just come along for free. This is projective geometry at work for you!