Simple Sudoku Helper

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

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 [4]1278 [4]2378 [4]1378 bk5 [5]12478 [4]1478 [3]178 bk9 [3]179 bk5 [4]2789 [5]16789 [5]12468 [6]124789 [5]14678 bk3 [3]147 [4]1379 [4]1789 bk4 [6]136789 [4]1368 [4]1789 bk2 [5]15678 [3]157 [4]1579 [5]16789 [5]56789 bk4 [2]18 bk3 [4]1679 [6]125679 [4]1257 bk2 [4]1467 [4]3567 [3]157 bk9 [3]157 [5]13467 [4]1567 bk8 [6]134579 [5]14789 [5]35789 bk2 [2]18 bk6 [5]13479 [4]1579 [5]13457 [3]479 [5]24679 bk1 [4]3689 [5]23468 [4]2489 bk5 [4]2789 [3]237 [3]579 bk3 [5]25679 [5]15689 [4]1268 [5]12589 [4]1789 bk4 [3]127 bk8 [3]249 [3]259 [4]1359 bk7 [5]12459 [3]139 [3]129 bk6