Simple Sudoku Helper

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

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

[4]3468 [6]346789 [6]346789 [4]3789 [5]35679 [5]56789 [3]569 bk1 bk2 [5]12368 bk5 [6]236789 bk4 [5]23679 [6]126789 [2]69 [4]6789 [4]6789 [5]12468 [6]146789 [6]246789 [5]12789 [5]25679 [7]1256789 [3]569 bk3 [6]456789 bk7 [3]389 [5]23589 bk6 [4]2359 [4]1259 bk4 [4]2589 [5]13589 [6]234568 [5]34689 bk1 [4]2379 [6]234579 [5]24579 [5]23569 [6]256789 [6]356789 [5]23456 [4]3469 [6]234569 [5]12379 bk8 [6]124579 [6]123569 [5]25679 [6]135679 bk9 bk2 [5]34567 [1]7 [3]467 [3]467 bk8 [3]456 [5]13456 [4]3468 [4]3468 [4]3468 bk5 bk1 [5]24689 bk7 [4]2469 [4]3469 [5]14568 [5]14678 [5]45678 [4]2789 [5]24679 bk3 [5]12569 [5]24569 [5]14569