You may use cursor, arrow keys, and Enter key to navigate.
Solver
About
This script is taken from webreference.com with only a few changes by Warren Porter. These are
The function "SudokuCell" defines "nColumn" but the "SudokuCell.prototype.filter" underneath calls debug() with "nCol" causing
the column to be "undefined" when displayed.
Color changed from lime to a dark beige. The cell borders were made thicker in the "Grid Entry" section to help
identify the group a cell is in.
When in "Grid Entry", pressing the return key takes the user to the 1st cell on the next row. This is in
addition to the use of the arrow keys.
Solved cells appear in blue to distinguish them from original values (black).
This page and code to display it.
The author of this program is Guyon Roche and can be contacted at www.silver-daggers.co.uk (but take out the "-").