Yet Another Sudoku Online
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YASON  Sudoku 
Frequently Asked Questions
 Getting started
 The aim of the puzzle is to enter the digits 1 through 9 in each cell
of a 9×9 grid so that each row, column, and region (3×3 subgrids) contains
exactly one instance of each digit.
You must enter digits 1..9 into free cells until the puzzle is solved.
Use the arrow keys or mouse to navigate. Enter '0' (zero) to clear a cell.
Invalid moves will be rejected with a warning message: for example entering
the same digit twice in a row will not be accepted.
Note that you still can enter wrong moves: watch out, or you
may end up in a deadend situation where no valid move is possible.
You can always click on 'Undo' to undo the last moves.
 Additional information on this game
 See wwWendt.de/tech/sudoku/
for some details about this program.
See Wikipedia
for some general information on Sudoku.
 Keyboard shortcuts

 Cursor: move to up, down left or right
 1..9: enter number in current cell
 0: remove entry (also [Del], [Space])
 [Tab]: move to next cell
 CtrlZ: undo last move
 CtrlH: show/hide hints
 [F5]: redraw
 Using Yason to solve existing Sudoku puzzles

 Click [Clear] to erase the board.
 Enter the digits to define your own puzzle.
 Expand the 'Position Details...' section at the bottom of this
page and click on [Set as initial position].
 Playing offline
 First, you should bookmark this page.
Once this page was opened in your browser, it is in the browser's cache
and may be played without being connected to the Internet.
Simply select "File  Work Offline" in the browser's menu and click on
the bookmark.
 Saving puzzles
 There currently is no [Save] function in Yason.
You may however expand the 'Position Details...' section at the bottom
of this page and copy the long numeric string into some text file.
To restore the puzzle, paste this string again into the position field
and click [Set as initial position].
(Note that the undo history is lost.)
 Sharing puzzles
 See 'Saving puzzles' on how to get and restore a puzzle as a text string.