Simple Sudoku Helper

6   +   +     +   4   +     +   +   3   +   1   +     +   +   +     +   7   +   +   +   5     +   +   +     8   +   +     +   +   +     5   +   2     +   +   +   3   +   +     +   9   +     +   +   2   +   +   +     1   +   3     +   +   +     +   +   8     +   +   +     9   +   +   +   7   +     +   +   +     +   5   +   2   +   +     +   3   +     +   +   4

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

bk6 [3]289 [3]279 [4]2789 bk4 [5]15789 [3]125 [3]129 bk3 [3]489 bk1 [4]2349 [5]23689 [4]2568 [4]5689 [4]2456 bk7 [3]569 [3]479 [4]2349 bk5 [5]23679 [4]1267 [4]1679 bk8 [5]12469 [3]169 [5]14789 [4]4689 [5]14679 bk5 [3]678 bk2 [5]13467 [6]134689 [5]16789 bk3 [4]4568 [4]1467 [4]4678 bk9 [4]4678 [5]14567 [4]1468 bk2 [5]45789 [6]245689 [5]24679 bk1 [3]678 bk3 [4]4567 [4]4689 [5]56789 [3]145 [4]3456 bk8 [4]2467 [5]12567 [5]14567 bk9 [4]1236 [3]167 [3]149 bk7 [5]13469 [5]24689 [4]1268 [5]14689 [4]1236 bk5 [3]168 bk2 [3]569 [3]169 [4]6789 bk3 [6]156789 [3]167 [3]168 bk4