Simple Sudoku Helper

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

bk4 [4]1257 [4]2357 [5]12379 bk8 [4]1257 [3]159 [3]157 bk6 [3]126 bk8 [4]2567 [6]124679 [5]14579 [6]124567 [4]1459 bk3 [4]1579 [3]136 [4]1567 bk9 [5]13467 [5]13457 [5]14567 bk2 [5]14578 [3]157 [5]12689 [5]12469 [4]2468 bk5 [3]147 bk3 [4]1469 [5]12467 [4]1279 bk7 [5]14569 [4]3456 [3]146 bk2 [3]146 [6]134569 [4]1456 bk8 [4]1236 [5]12456 [5]23456 bk8 [3]147 bk9 [5]13456 [6]124567 [5]12357 [4]2689 [4]2469 bk1 [4]2349 [4]3459 [4]2458 bk7 [4]2568 [3]235 [3]268 bk3 [5]24678 [4]1247 [4]1457 [6]124578 [4]1568 bk9 [3]125 bk5 [3]279 [3]278 [5]12379 bk6 [4]1278 [3]138 [3]128 bk4