• Row elimination
  
• Column elimination
  
• Box elimination
  

Select a number from the choices in a cell.
Repeat, until puzzle is solvable.
If a 'G' appears in a cell, click it for guessing
(Works only if one choice solves and the other
ends in invalid puzzle.)
Click selected numbers to un-select.
An orange 'X' denotes an error, un-select
one or more numbers to fix the problem.

Copyright © 2005 Christian Wolff
scarabaeus.org/cgi-bin/sudoku