Simple Sudoku Helper

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

bk3 [3]579 [3]789 [4]5789 bk4 [5]15678 [3]157 [3]579 bk2 [5]25789 bk1 [5]24789 [6]235789 [4]3579 [5]23578 [4]3457 bk6 [4]4579 [4]2579 [5]24579 bk6 [5]23579 [5]13579 [5]12357 bk8 [5]34579 [5]14579 [4]2578 [5]23457 [5]23478 bk1 [3]357 bk9 [5]24567 [5]24578 [4]4578 bk6 [5]24579 [5]12479 [3]257 bk8 [3]257 [5]12457 [5]24579 bk3 [6]125789 [5]23579 [6]123789 bk6 [3]357 bk4 [4]1257 [5]25789 [5]15789 [3]127 [4]2367 bk5 [4]3478 [4]1367 [5]13678 bk9 [5]23478 [3]478 [3]279 bk8 [4]2379 [5]34579 [5]35679 [4]3567 [5]23457 bk1 [3]457 bk4 [3]379 [4]1379 [5]35789 bk2 [5]13578 [3]357 [4]3578 bk6