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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  who call it Hitori.
Singles was contributed to this collection by James Harvey.
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). Clicking outside the grid will toggle whether black squares completely hide the numbers on them, or display them in dark grey.
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.)
These parameters are available from the ‘Custom...’ option on the ‘Type’ menu.
On platforms that support user preferences, the ‘Preferences’ option on the ‘Game’ menu will let you configure whether numbers on black squares are visible. Unlike clicking outside the grid, this will persist between games.