﻿ Outside 1 & 9 Sudoku variant
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# OUTSIDE 1 & 9 SUDOKU ONLINE

 1 2 3 4 5 6 7 8 9
 LEV   1 (8) PUZ

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
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.

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.