function Puzzle(puz, dis, pos) {
    this.value = puz;
    this.isDisabled = dis;
    this.possibles = pos;
}

The Puzzle prototype contains 3 arrays, each of size 81: value, disabled, and possibles. Values contains strings of each cells current number value, with "0" saved for an empty cell. isDisabled contains a boolean value, true if the cell should be immutable. Possibles contains strings that go into the uper left of each cell, allowing the user to save possible values for each cell.

• highlightRow

  Pass a row and column, this function will visually highlight an entire row and the specific cell.

• highlightColumn

  Pass a row and column, this function will visually highlight an entire column and the specific cell.

• highlightBox

  Same as the above two, but this one higlights the box that the cell is in. I'm proud of this one, it uses MATH.

• clearPuzzle

  Clears the sudoku board.

• clearPuzzleStyles

  Removes any inline style attributes from the puzzle cells.

• updateButtons

  Shows/hides buttons depending on the state of the puzzle. If the puzzle is empty (void of any numbers) it hides:

  • Save
  • Clear
  • Possibles
  • Next
  • Solve As soon as any input is made or numbers are loaded into the puzzle it shows the buttons again.

• showButtons

  Helper method to show the applicable buttons.

• hideButtons

  Helper method to hide the applicable buttons.

• displayPuzzle

  Takes a Puzzle object displayes all included info in relevant place on the board.

• puzzleToObject

  Returns the currently displayed puzzle as a Puzzle object.

• savePuzzle

  Accepts a key string and puzzle array and saves it to localStorage. Requires browser support.

• loadPuzzle

  Accepts a key string and loads the matching puzzle from localStorage, if it exists.

• countFilled

  Returns the number of currently filled in squares on the puzzle board.

• updateProgressBar

  Updates the progress bar displayed (if supported) below the puzzle to reflect the percentage of cells completed.