SudokuSolver Forum

Hi,

here is a hard greater than sudokua freind send me. I would like to see your solutions because i come to a point where i think guessing is the only way to solve it.


http://www.fotos-hochladen.net/uploads/ ... gsu9ai.jpg

How is that a greater-than sudoku? That looks like a killer sudoku to me. If you're trying to solve it as a greater-than, that might be why you're having difficulty.

It is neither a Greater Than Sudoku or a Killer Sudoku, it is a Kenken

A kenken uses the four mathematical operands, numbers can repeat in a cage where the cells don't see each other

example


the +11 cage in R1C1 can be 56 or 65 (Only one should be used in the one cage as they can be in any order)

the -3 cage in R1C4 could be 14, 41, 25, 52, 36, 63 (Only one should be used in the one cage as they can be in any order)

the x120 cage in R3C3 be 456, 465, 546, 564, 645, 654 (Only one should be used in the one cage as they can be in any order)

the /2 cage in R5C2 could be 12, 21, 24, 42 (Only one should be used in the one cage as they can be in any order)

The Puzzle was From The Times Kenken 2269

So what is the difference between a killer and a kenken? I'm not up on the terminology for puzzles using mathematical operations (other than comparisons).

The difference is that Killer Sudoku's only use Addition in the cages, where as Kenken cages can use any operand, except for the fact that subtraction and division cages are limited to two cells.

example 1


that cage must be 5-4-5 as 5*4*5=100

whereas in a killer sudoku

Example 2


even though that in this example the nonet innie can't see the right outie, numbers can not repeat in the cages so this cage can not be 5+4+5

but it can be 1+4+9, 1+5+8, 1+6+7, 2+3+9, 2+4+8, 2+5+7, 3+4+7, 3+5+6

and also unlike Kenken, Killer Sudoku has 3x3 nonets which numbers can't be repeat.0

Ahh! Thanks for the explanation! I'm not a big fan of the mathematics-type puzzles, although I don't mind the comparison ones (GTLT, odd-even, non-consecutive, etc.).