Simple Sudoku Helper

4   +   +     +   1   +     +   +   8   +   5   +     +   +   +     +   2   +   +   +   6     +   +   +     9   +   +     +   +   +     9   +   2     +   +   +   8   +   +     +   5   +     +   +   3   +   +   +     1   +   8     +   +   +     +   +   9     +   +   +     6   +   +   +   2   +     +   +   +     +   5   +   1   +   +     +   7   +     +   +   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 [3]379 [3]237 [5]23567 bk1 [5]35679 [3]357 [3]367 bk8 [3]379 bk5 [4]1378 [5]34678 [5]34689 [5]34679 [4]1347 bk2 [3]167 [3]237 [4]1378 bk6 [6]234578 [4]2348 [4]3457 bk9 [4]1347 [3]157 [4]3567 [5]13467 [5]13457 bk9 [3]346 bk2 [5]14578 [5]14678 [4]1567 bk8 [5]14679 [4]1247 [3]467 bk5 [3]467 [4]1247 [5]14679 bk3 [6]235679 [5]34679 [5]23457 bk1 [3]346 bk8 [4]2457 [4]4679 [5]25679 [3]357 [4]3478 bk9 [5]23458 [4]2348 [4]1345 bk6 [4]1378 [3]127 [3]367 bk2 [4]3478 [4]3468 [5]34689 [5]13469 [4]1378 bk5 [3]179 bk1 [3]368 [3]358 [5]23568 bk7 [4]3569 [3]238 [3]389 bk4