Simple Sudoku Helper

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

[5]45678 [5]45789 [6]456789 [5]56789 [5]36789 [6]356789 [3]379 bk1 bk2 bk3 [6]145789 [6]245789 [6]125789 [5]12789 [5]25789 [2]79 bk6 [5]45789 [6]125678 [5]15789 [6]256789 [7]1256789 bk4 [7]2356789 [3]379 [4]3589 [5]35789 bk9 [5]13478 [5]34678 [4]2678 [5]23678 [6]234678 bk5 [4]2348 [5]13468 [4]4568 [4]3458 [5]34568 [5]25689 [5]23689 bk1 [4]2369 bk7 [5]34689 [6]145678 bk2 [6]345678 [5]56789 [5]36789 [7]3456789 [4]1369 [4]3489 [6]134689 [3]278 [3]789 [4]2789 bk3 bk5 [5]26789 bk4 [2]29 [4]1679 [3]257 [4]3579 bk1 bk4 [4]2679 [4]2679 bk8 [4]2359 [5]35679 [5]24578 bk6 [7]2345789 [5]12789 [5]12789 [4]2789 [5]12379 [4]2359 [5]13579