To circle a discovered word, mouse-click on one end of the word and mouse-drag to the other end of the word. Words may be hidden horizontally, vertically, diagonally, forward, or backward.
(If you don't see the words below you need Javascript enabled in your browser to play this game!)

The object is to first shuffle the numbers (click the "shuffle" button), then try to re-assemble the natural order (1 to 15, with the empty square in the lower right corner) To move a number into the currently empty square, simply click it.