Simple Sudoku Helper

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

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

bk7 [3]369 [3]389 [4]1689 bk2 [5]13569 [3]139 [4]1359 bk4 [4]2346 bk5 [4]2349 [5]14679 [4]1379 [5]13469 [5]12379 bk8 [3]237 [4]2348 [4]2349 bk1 [4]4789 [5]35789 [4]3459 bk6 [5]23579 [4]2357 [5]24568 [4]2469 [5]24589 bk3 [2]19 bk7 [4]1248 [4]1256 [4]2568 bk1 [4]2347 [6]234578 [2]24 bk6 [2]24 [5]23478 [4]2357 bk9 [4]2346 [6]234679 [5]23479 bk5 [2]19 bk8 [5]12347 [5]12367 [4]2367 [3]234 [5]12347 bk6 [5]12789 [5]13789 [4]1239 bk5 [4]2379 [4]2378 [3]235 bk8 [4]2357 [5]12679 [5]13579 [6]123569 [4]2379 bk4 [4]2367 bk9 [3]237 [4]2357 [4]2678 bk4 [4]2356 [4]2378 [4]2367 bk1