SUDOKU Firefox Add-on

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This page describes my firefox add-on called SUDOKU. The main goals of the project are:

• To play sudokus from various web pages.
• To record played sudokus, to allow re-playing, to record best times.
• To stay simple yet powerful.
• And one more small goal: to be the best javascript sudoku engine out there.

Installation

You need Firefox 3 to install sudoku. Click sudoku-0.9.9.xpi to install. I have also put this add-on to addons.mozilla.org but it is marked experimental and it will stay as such until someone from mozilla reviews it. It appears to me that the more people use an add-on the bigger the chance to have it reviewed is, so if you like the add-on please install it from addons.mozilla.org, rate it, review it, tell your friends about it, promote it...

Usage

Sidebar

After the installation, you can display the SUDOKU sidebar, either by pressing Ctrl+Shift+S, or from menu View->Sidebar->Your SUDOKUs. The sidebar contains all the SUDOKUs known to the add-on. By pressing the button View, you can choose the difficulty. The SUDOKUs are sorted by the best time, those that haven't been played yet are on top. If you want to play a puzzle, click the >> in the column Play, or press Enter on the SUDOKU of your choice.

Even though the add-on is meant to be used for playing SUDOKUs found on web, it contains a small set of puzzles for you.

Web SUDOKUs

The add-on can detect SUDOKUs on some web-pages. If that happens, a notification is shown.

You can either play the puzzle or save it for later. In either case it will appear in the list of unrated puzzles in your sidebar. If the add-on detects a puzzle that has already been played or saved, another notification is shown:

The add-on can detect puzzles from following sites:

• http://websudoku.com/
• http://www.sudokupuzz.com/
• http://sudoku.com.au/
• http://www.bin-co.com/javascript/sudoku/
• http://www.online-sudoku.cz/hrat/

If you know about any other it supports, please let me know. If you wish to add support for some more, let me know as well, I will see what I can do. Post me a note to: mailto://petrb.feedback+sudokuenq@gmail.com.

Let's play

Finally the most important part. As you might have noticed, most of the web SUDOKU engines require you click on the cell and press a key - preferably a number. My approach is much closer to native applications. First, choose the number you want to place, then click on cells to place the number.

The features include:

• Highlighting of the column and row under the mouse.
• Highlighting of the number being placed.
• Highlighting of mistakes.
• Marking of the used-up numbers.
• Placing hints.

Some tips:

• You can place/remove hints by middle-click, right-click or ctrl-click. Pick one that does not clash with your browser settings.
• You can press numbers to select the number to be placed. (see known bugs)
• Select an eraser by pressing a spacebar or 0.
• Double-click on a cell to clear it. Double-click also selects the next number to place.

Known bugs

• You must first click somewhere on the SUDOKU page before you can use keyboard.

Planned features

• Make the sidebar nicer.
• The puzzle should not always open in the new tab.
• Add the function to open a random puzzle.
• Add puzzle rating.
• Add the possibility to save a puzzle in the middle of playing and return to it later.
• Add the possibility to define puzzles.