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You have a grid of squares. Your aim is to draw a diagonal line through each square, and choose which way each line slants so that the following conditions are met:
Credit for this puzzle goes to Nikoli .
http://www.nikoli.co.jp/puzzles/39/index.htm (in Japanese)
Left-clicking in a blank square will place a
\ in it (a line leaning to the left, i.e. running from the top left of the square to the bottom right). Right-clicking in a blank square will place a
/ in it (leaning to the right, running from top right to bottom left).
Continuing to click either button will cycle between the three possible square contents. Thus, if you left-click repeatedly in a blank square it will change from blank to
/ back to blank, and if you right-click repeatedly the square will change from blank to
\ back to blank. (Therefore, you can play the game entirely with one button if you need to.)
You can also use the cursor keys to move around the grid. Pressing the return or space keys will place a
\ or a
/, respectively, and will then cycle them as above.
(All the actions described in section 2.1 are also available.)
These parameters are available from the ‘Custom...’ option on the ‘Type’ menu.