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Rules -- Blackbarrier Jam

Blackbarrier Jam was invented by the Japanese puzzle company Nikoli (under the name Kurodoko, FKA Where is Black Cells). It is one of several of their puzzles based on the unique rules regarding the placement of black cells in Japanese crosswords.


1. Determine whether each cell is white or black according to the following rules.
2. No numbered cell may be black.
3. A number indicates how many grid cells, including the cell itself, lie in an uninterrupted horizontal or vertical line from that cell, up to the perimeter of the puzzle, or a black cell (whichever is closer).
4. No two black cells may share an edge. All of the white cells must be connected to each other through their edges.

2 comments

thepace said...

Hi,

kudos to your creativity.
I have a query about the rules of the game.Considering the above example,
There are 11 black boxes,38 white boxes while the sum of the numbers=40. So this means that white spaces can be counted multiple times.
Secondly, the total count does not necessarily mean the vertical and horizontal spaces in same column and row in which the number is.

I will be glad if you could use different colour for each number and colour its pertaining white spaces with that colour. This will make the puzzle more comprehendible.

Please correct if wherever I am wrong.

Waiting to start with the puzzle after I get my doubts cleared.

Thanks

Grant Fikes said...

3. A number indicates how many grid cells, including the cell itself, lie in an uninterrupted horizontal or vertical line from that cell, up to the perimeter of the puzzle, or a black cell (whichever is closer).

The 8 in the upper left counts itself, the three white cells to its immediate right, and the four white cells immediately below. The black cells prevent the white cells behind them from being included in the count. The 2 in the center counts itself and the white cell immediately above.

Does this help?

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