SUM FRAME SUDOKU ONLINE

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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.