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for the lazy people; each clue multiplies by 4 :

symbols permute by (permutation in cycle-notation)

(1,2,3,4)(5)(6,7,8,9), when the grid is rotated.

- Code: Select all
`1236.....`

5642.....

...1.....

.........

.........

.........

.........

.........

.........

rated easy

whenever cell C contains symbol s then C rotated by 90'

counter-clockwise contains symbol p(s) with

p(1)=2

p(2)=3

p(3)=4

p(4)=1

p(5)=5

p(6)=7

p(7)=8

p(8)=9

p(9)=6

so in the above example the 4 corners must be:

- Code: Select all
`1.......4`

.........

.........

.........

.........

.........

.........

.........

2.......3

etc.

the other sudoku rules apply.

Can someone make a rotational sudoku with 9 different clues

or with 8 clues ?

-Guenter