Simple Sudoku Helper

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

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 [3]248 [4]2348 [5]23458 bk7 [5]13458 [4]1358 [4]1358 bk9 [3]348 bk1 [5]34789 [5]34589 [4]3469 [5]34568 [5]35678 bk2 [3]357 [3]238 [4]2789 bk5 [4]2389 [5]12369 [4]1368 bk4 [5]13678 [3]137 [4]3458 [5]45678 [5]34678 bk1 [2]34 bk2 [5]35789 [5]35789 [4]3457 bk9 [4]2457 [4]2347 [4]3457 bk8 [4]3457 [4]1357 [4]1357 bk6 [6]123458 [5]24578 [5]23478 bk6 [2]34 bk9 [5]13578 [5]13578 [6]123457 [3]458 [5]45689 bk1 [5]34789 [4]3469 [5]34678 bk2 [5]35679 [3]357 [3]258 bk3 [4]2689 [4]2789 [4]1269 [4]1678 [5]15679 bk4 [3]157 bk7 [4]2469 [4]2469 [4]2349 bk5 [4]1346 [4]1369 [4]1369 bk8