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Monday Mutant 40: Cross the Streams (partially inverted)

Shade in some cells black such that the black cells are all connected to each other through their edges, and no 2x2 cell area within the grid contains all black cells. Numbers to the left of a row represent the groups of consecutive black cells which are in that row. For example, a clue of "3" means the row has three consecutive black cells, and a clue of "3 1" means that the row has a group of three consecutive black cells followed by a single black cell, separated by at least one white cell. In the same fashion, numbers above a column represent the groups of consecutive white cells which are in that column. A question mark (?) represents a group of consecutive black or white cells whose size is unknown; an asterisk (*) represents any number of unknown groups of black or white cells, including none at all.
Cross the Streams is back with a vengeance!

8 comments

Spheniscine said...

You may wish to correct the description... the black cells thing still says "row and column".

Grant Fikes said...

Spheniscine: Done.

Spheniscine said...

Nice variant of an original puzzle type. :3

Anonymous said...

Just seeing too many solutions here - no uniqueness, unless there is supposed to be some additional constraint of which I am unaware - such as no surrounding a set of white cells, or can't snake around to touch itself.

Sorry.

Ken
"TheSubro"

Grant Fikes said...

ralphmerridew solved this puzzle without reporting any problem -- he very likely would have found the mistake if there was one.

Are you sure you read the rules carefully? The horizontal clues in this mutant Cross the Streams refer to black cells, as per usual, but the vertical clues refer to white cells. For example, in the ninth column, there is a group of 2 white cells, possibly followed by other white cells.

Anonymous said...

As fate would have it, I set out to make great sets of the alternate solutions to proudly send to you and plan on doing so on Excel, and I solve it without an issue this time with one possible solution.

I know the rules and the constraints and stumbled repeatedly somewhere, I just dont know where.

So, ... never mind.

Thanks for a great treasure trove of puzzles lately. Much appreciated.

Ken
"TheSubro"

Blaine said...

I think I have the correct solution. Can you confirm?

In the NW quadrant the black square count is X.
In the NE quadrant the black square count is X+1
In the SW quadrant the black square count is X-1
In the SE quadrant the black square count is X+4

Grant Fikes said...

Blaine: That is correct. :)

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