The aim is to put 8 coloured dots on the 8×8 board so that
no two dots are in the same row, column, or diagonal. This is often called
the 8 Queens Problem, as it is equivalent to placing 8 queens on a chessboard
so that no two pieces attack each other.
Two or three red dots are given, and you have to supplement
them with green dots to make an 8 queens pattern.
In the Blockade puzzles(indicated by red numbers), the red dots do
not take part in the pattern but merely restrict the movement of the green dots.
You have to place a green dot in every column to make an 8 queens pattern, but
cannot move a green dot down past a red dot.
Simply click on the spots of the board where you want a green dot to be; or
on the top edge of the puzzle to remove a dot from a column of the board.
Normal puzzles are shown with a green or yellow puzzle number and blockade puzzles with
a red number.
Most puzzles have a unique solution. In some puzzles there are two solutions
shown as a dot after the puzzle number.
Blockade puzzle #1 has 3 solutions and Personal puzzle #12 has 9!
Note: The personal set is a cloned blockade set with puzzles #1, 11, 12 and 13 'personalised' or modified to 'frustr8te' you a bit more!
The 'Check' button will show any mistakes you have made by lighting up two dots that are in the same row, column or diagonal,
or by lighting up a column that is still missing a dot. If there is more than
one mistake, just click the button several times to see them in turn.
The 'Solution' button will give you a solution to the current puzzle.
If you click it again, it will show another solution; if it exists.
The set next '▲' and the set previous '▼' buttons will cycle the puzzle counter up & down the puzzle sets.
