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Daily Hitori - Help



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Rules / Objectives Summary

See the Walkthrough or Advanced Ideas below for extra tips and tricks.



Hitori Puzzle
What is the objective?
You are to eliminate duplicate numbers in the rows and columns.

You can only have (at most) one of any given number in each row and column (sometimes none).

Sometimes you don't have any of a given number in a row or column, and sometimes there are no Black squares in a row or column.

Click or move your mouse over the puzzle to see the answer.



Walkthrough



Help 1
Step 1
This is the start of the puzzle.

Solve this puzzle for yourself at the same time.


Help 2
Step 2
As we're only allowed one <3> in Column 4, one of these squares is Black. Whichever that is, the square between the two must be White.


Help 3
Step 3
As we've now found a <5> in Column 4, all other <5>'s in the same Row or Column must be Black.


Help 4
Step 4
All squares surrounding a Black one must be White.


Help 5
Step 5
We've found a <3> in Column 3, so this square is Black (and those surrounding it are White).


Help 6
Step 6
This square is Black as we've already a <3> in Column 4.


Help 7
Step 7
We are not allowed isolated White squares, so this square must be White to avoid the <5> in the corner becoming isolated.


Help 8
Step 8
We've already a <1> in Column 5, so this square is Black.


Help 9
Step 9
These squares must be White to avoid isolated White squares.


Help 10
Step 10
These squares are Black as we've already a <4> in Row 3, and a <3> in Column 2.


Help 11
Step 11
This square must be White to avoid the bottom White section becoming isolated.


Help 12
Step 12
This square must be White as we've already a <1> in Column 2, and the puzzle will then complete.


Help 14
Step 14
The completed puzzle.


Advanced Ideas



Hitori puzzles require some interesting thinking techniques and I've listed a few advanced ideas here.

Idea 1
We are only allowed one <1> in Column 3, so one of these squares must be Black. Whichever is Black, the square between them must be White.


Idea 2
Just considering the <1>'s in Row 1 we know that the right-hand <1> cannot be White, otherwise both of the others would have to be Black, which isn't allowed. Therefore the right-hand <1> is Black.


Idea 3 Idea 4
One of the <2>'s in Column 2 is Black. If the top one is Black, then the <5> to its left must be White, but also the <3> below the <5> must be White to avoid isolated White squares. Or the bottom <2> is Black, which means the <3> to its left is White. In both cases, the <3> indicated is White.

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