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Hitori Help

Rules / Objectives Summary

  • Eliminate numbers until there are no duplicates in any row or column.
  • Eliminate numbers by marking them in Black.
  • You are not allowed to have two Black squares touching horizontally or vertically.
  • White cells must not be isolated from the rest of the board.

See the Walkthrough or Advanced Ideas 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.

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 we've listed a few advanced ideas here.

  • 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.
  • 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.
  • One of the <2>'s in Column 2 is Black. If the top one is Black, then the <3> to its left must be White, but also the <1> below the <3> must be White to avoid isolated White squares. Or the bottom <2> is Black, which means the <1> to its left is White. In both cases, the <1> indicated is White.

 

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