Sudoku
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Rules


Sudoku implements the well-known number puzzle. Objective of Sudoku is to fill the empty cells with digits ranged from 1 to 9 in a valid pattern. Some cells are already holding fixed digits and cannot be edited. A valid pattern means that

On clicking an empty cell it gets marked by a question mark symbol. The question mark indicates that no specific number is selected for this cell so far. Now you can select a digit ranged from 1 to 9 to fit in the cell. To clear the cell a question mark can be reselected, too.

Some hints and facts

The Sudoku generator in use here is explicitly not only supporting symmetric cell patterns that often can be found in other Sudokus.

This type of number puzzle does actually not have Asian origin. Anyway it got popular under the name Sudoku being published by a Japanese puzzle company in mid 1980s. Sudoku is an abbreviation of the Japanese Suji wa dokushin ni kagiru. This could be translated to Digits must be singletons.

Any Sudoku solution represents a form or relation towards so called Latin square in a Mathematical sense.

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About Sudoku

Oliver Merkel, cc-by-nc-nd 4.0.

Legal

Copyright (c) 2016
@author Oliver Merkel, Merkel(dot) Oliver(at) web(dot) de.
All rights reserved.
Logos and trademarks belong to their respective owners.

All source code also including code parts written in HMTL, Javascript, CSS is under MIT License.

The MIT License (MIT)

Copyright (c) 2016 Oliver Merkel, Merkel(dot) Oliver(at) web(dot)de

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

If not otherwise stated all graphics (independent of its format) are licensed under
Creative Commons License
Images are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Sudoku Principles and Concepts

The basic concept of number puzzles or more general just number constellations based on Latin squares belongs to the public domain due to its age and unknown creator.

This Sudoku type of number puzzle does actually not have Asian origin. Anyway it got popular under the name Sudoku being published by a Japanese puzzle company Nikoli in mid 1980s. Sudoku is an abbreviation of the Japanese Suji wa dokushin ni kagiru. This could be translated to Digits must be singletons.

Third Party Code Licenses

This Sudoku implementation uses unmodified independent code libraries provided by third parties. Since their licenses might vary the corresponding information is externally linked below. Thus these external links will enable you to reproduce any copyright notice, any related list of conditions, disclaimers, and especially the copyright holders and authors of the corresponding third party functionality.

jQuery: MIT jQuery Mobile: MIT
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