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README.md

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This project implements the Sudoku web app used on SudokuExchange.com.

Features include:

  • Enter a puzzle into a blank grid (e.g: transcribe a printed puzzle)
  • Check that the puzzle has a unique solution (in case you made a typo)
  • Share a puzzle as a link like this
  • Two types of pencilmarks (for Snyder notation and doubles/triples or simple candidate lists)
  • Cell colouring
  • An optional dark mode theme
  • Keyboard shortcuts for desktop browsers (including Ctrl-Z/Y Undo/Redo)
  • Touchscreen support for mobile or tablet browsers
  • Help option on the menu to access user guide
  • Multi-cell selections for entering pencil marks
  • Flexible display: scales up to huge screens or down to small screens, adapts automatically to portrait vs landscape orientation, and supports full screen mode to remove distractions
  • Configurable options so you can turn on the features you find helpful and turn off the features you find annoying
  • Free to use and no ads
  • Full source code available

Copyright and License

This software is copyright (c) 2019 Grant McLean grant@mclean.net.nz and is released as free software under the terms of the GNU Affero General Public License (AGPL) version 3 or later. You may use, copy, modify and share the software under the terms of that license.