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The Outside 1 & 9 Sudoku is a variant based on the Between 1 and 9 Sudoku.
You have to place digitis in the grid like a classic sudoku such that each row, column and 3x3 box contain the digits 1 to 9.
Numbers in the outside frame equal the sum of digits before 1 or 9 in the corresponding row or column in the given direction.
As an aid, we have made an overview of the possible combinations of 5 to 35 across 2 to 6 cells. You can view them HERE.
We give you a head start with the first puzzle. Look where you can place a 1 or a 9. The bottom left cell needs a 9 because the 1 is already in that row and the number in the left frame is "0" indicating that there are no digits before 9.
|SOLVING OUTSIDE 1 AND 9 SUDOKU|
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.|
|PLAY OUTSIDE 1 AND 9 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.|