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Daily Hitori Puzzle

Tuesday 30th March 2010

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How to play

Hitori is a game played on a rectangular grid of numbers. The aim is to eliminate cells (by turning them blue), so that the following rules are followed,
  1. Each row and column may only contain each number once (i.e. in white). Note that this does not mean that a row or column has to contain any particular number.
  2. You can't have two blue cells next to each other. Linked diagonally is fine.
  3. All the white squares must be one single connected whole, i.e. from any white starting square, you must be able to reach any other white square by only moving to adjacent white squares. Diagonal moves are not allowed.
From these rules we can make a few conclusions,
Hitori puzzle solution
This is an example of a completed Hitori puzzle. Note that the each row and column has only one of each number in white, there aren't any blue cells touching another blue cell, and all the white cells are one single connected whole.
Hitori puzzle
This is an example of a starting grid. I have highlighted two cells that we can start with.
  • Look at the left-most column. There are two 7s together at the bottom, since we can't have remove both of these cells, one must be blue, the other must be white. We don't know exactly which way round (yet). Since we can only have one white number in each column, the highlighted 7 must be eliminated.
  • We can apply the same technique to the highlighted 6, but by looking at the row instead.
We can also go a step further, since eliminated blue cells can't touch any other eliminated blue cells, then all the cells around the 7 and the 6 must be white.
Hitori puzzle
We now have 7 cells in white. For each of these we can now look at each in turn, and eliminate any duplicates from the row/column.
Hitori puzzle
That gives us this grid. We now apply the same process again, all the cells surrounding any blue cells must be white.
Hitori puzzle
This is where rule 3 starts to come in to play. The white cells must be one single connected whole. We have a 4 in the top-left with a 2 just to the right of it. This 2 must be white, otherwise the 4 would be isolated and we would have created two islands of white cells.
We can apply this same reasoning to the white 2 in the left-most column, the 7 next to it must also be white.
We can now apply these same rules to finish this puzzle.
This page will automatically load the puzzle for today. If you want to play a different puzzle, go to the archive page and choose your puzzle.
There are two ways to play a Sudoku puzzle, you can just use the mouse/touchscreen, or you can use the mouse and keyboard. You can switch between the two methods any time you like, and can use a combination of both.

Playing with a mouse/touchscreen.

Playing with a mouse and keyboard.

Any mistakes you make will be hilighted in red. The website will know when you have completed a puzzle and will tell you. If you have an account and are logged in, the website will remember that you have completed that puzzle. You will also take part in out leaderboards. It's free to create an account!

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