A SIKAKU puzzle consists of a square or rectangular grid in which some of the cells contain a one or two digit number. To complete
the puzzle, a Solver must divide the puzzle into a number of rectangles so that each rectangle contains exactly one of the numbers, and
that number must be equal to the area of the rectangle which contains it.
Solving the puzzle is a purely mouse operation. When you have determined where one of the rectangles must be located, mouse click into one
of the corner cells of the rectangle, and drag to the cell in the opposite corner. A red outline will show you the rectangle you have
selected in this way. When you release the mouse, the outline of the selected rectangle will change to black.
If you make a mistake, you can remove individual segments of the outline of a rectangle by pointing to any point near the center of that
segment and clicking the mouse.