Simple Sudoku Helper

+   +   +     +   +   +     +   1   4   +   +   +     +   +   +     2   +   3   8   +   +     +   5   +     +   +   +     +   +   +     2   +   7     +   +   +   +   3   1     +   +   +     +   +   +   +   +   +     +   +   +     6   5   +     6   +   +     +   +   +     7   +   +   +   +   +     1   4   +     +   +   +   +   +   +     3   +   +     +   +   +

Enter some numbers and press "Update" Cells that contain just a number are completed; the only option provided by the drop-down box is bk (for "back") which will un-set the box. Cells that contain a number in square brackets are currently uncompleted; the number shows how many legal entries there are, and the drop-down box permits the selection of one of those legal entries. Get Another One

[5]23579 [5]25679 [6]235679 [4]6789 [6]236789 [5]23689 [3]589 bk1 bk4 [5]14579 [6]145679 [5]45679 [5]46789 [5]16789 [5]14689 bk2 [4]6789 bk3 bk8 [6]124679 [6]234679 [4]4679 bk5 [6]123469 [1]9 [3]679 [3]679 [3]459 [5]45689 [5]45689 bk2 [5]13689 bk7 [5]13489 [4]3489 [3]189 [5]24579 bk3 bk1 [5]45689 [3]689 [5]45689 [3]489 [5]24789 [4]2789 [4]2479 [5]24789 [5]24789 [3]489 [4]1389 [5]13489 bk6 bk5 [5]12789 bk6 [6]124589 [6]234589 [3]589 [3]289 [4]2589 bk7 [5]23489 [5]12589 [5]23579 [5]25789 [6]235789 bk1 bk4 [5]25689 [4]3589 [5]23689 [5]25689 [6]124579 [7]1245789 [6]245789 bk3 [5]26789 [5]25689 [5]14589 [5]24689 [6]125689