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Frame Sudoku aka Outside Sum Sudoku consists of an empty grid. Numbers outside
the grid equal the total of the first 3 numbers in the corresponding row or column in the given direction.

SOLVING SUM FRAME SUDOKU

CHOOSE PUZZLE:

LEV: choose a level of difficulty. Between brackets is the number of puzzles per level. PUZ: enter the puzzle number of your choice. START: choose this to load the puzzle.

ROW:

In front of every ROW you will find the
missing digits for that row.

COLUMN:

Above every COLUMN you will find the
missing digits for that column.

BOXES (1-9):

At the top left are 9 boxes with the missing digits of the
9 subgrids.

NUMBER OF DIGITS:

At the top you can see how often a number has already been entered and where.

SOLVE A FRAME SUDOKU

ENTERING DIGIT(S):

On the left, cells in white color, choose the digit(s) you want to enter and then click on the sudoku cell of your choice. Choose a digit and the empty cell below digit 9 if you want to place 1 digit in small size.

BUTTON ✓:

Choose ✓ button to check the puzzle. All the correct numbers turn GREEN just like the initial numbers and now can
not be changed anymore.

BUTTON SOL:

Click on the SOL button to display the puzzle solution.