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Chapter 32: Singles

You have a grid of white squares, all of which contain numbers. Your task is to colour some of the squares black (removing the number) so as to satisfy all of the following conditions:

Credit for this puzzle goes to Nikoli [15] who call it Hitori.

Singles was contributed to this collection by James Harvey.

[15] (beware of Flash)

32.1 Singles controls

Left-clicking on an empty square will colour it black; left-clicking again will restore the number. Right-clicking will add a circle (useful for indicating that a cell is definitely not black).

You can also use the cursor keys to move around the grid. Pressing the return or space keys will turn a square black or add a circle respectively, and pressing the key again will restore the number or remove the circle.

(All the actions described in section 2.1 are also available.)

32.2 Singles parameters

These parameters are available from the ‘Custom...’ option on the ‘Type’ menu.

Width, Height
Size of grid in squares.
Controls the difficulty of the generated puzzle.

[Simon Tatham's Portable Puzzle Collection, version 20220128.c43a34f]