This sounds easy in theory, but in practice, it will be hard to achieve. Try switching your way from easy to hard and hard to easy each time to keep finding the hidden numbers and setting new candidates for the cells. Since the grid of Sudoku is constantly evolving and finding the placement of a digit unlocks new possibilities each time, you must keep repeating these techniques. You are bound to find the solution of at least one cell by doing this. Start with the ones you first used in the easy levels and work your way through the grid until you reach the XY-Wing technique. If you do not want to clutter your mind with patterns seemingly coming out of an advanced mathematics book, the best way to tackle an evil Sudoku puzzle is by applying all your previously learned strategies. In reality, they derive from patterns created by hard level techniques. Evil Sudoku Solving TechniquesĮvil Sudoku Solving Techniques such as the Jellyfish or the Medusa can look more complicated and harder to understand than the puzzle itself. Players should not attempt them unless they have already mastered the previous levels, as they might lose faith in their skills from the start and forfeit Sudoku completely. These puzzles are not made for the weak hearted. Working through the grid to find the solutions requires extreme attention, a lot of patience and an over-familiarity with the numbers. The rules are still the same as ever, but the allocated clues at the start of the game are even more reduced. Hard puzzles have become a fun hobby and they are currently looking once again for the thrill of facing a seemingly impossible challenge.

Here we will use the above strategies to solve a puzzle.Evil Sudoku Puzzles are made for those players who are extremely confident in their logic skills and believe to be experts by now. The sumĬalculator found in the online player page canĪpplying the basic strategies. Has a total of 3, 4, 16, or 17 there is only one combination of values Many ways of reducing the number of sums. Making a sum, can often lead to a potential solution. Reducing the number of different possible ways of Sum Elimination This strategy examines the different possible ways of making the Possible values, then no other cell in that region can contain any of If there are kĬells contained entirely in a region that contain exactly k different Rule of K The Rule-of-k is an extension of the Rule-of-1. If S is the sum of all the cages containedĮntirely in a region, then the cells not covered must Thus, each sudoku region has a total value Rule of 45 Each sudoku region (i.e., row, column, or nonet) contains theĭigits one through nine. Thus, if all the digitsīut one appear in a row, the missing digit must appear in the empty In the former case, each region must containĪll the digits one to nine. Rule of Necessity This rule can be applied to sudoku regions (i.e., row, column, or Likewise, each digitĬan appear in a cage only once. Row, it cannot be in any other cell in the row. In a sudoku region each digit appearsĮxactly once. No region canĬontain any duplicate digits. Rule of 1 This comes directly from the definition of sudoku. The following are the basic rules used to solve killer sudokus. (The Terminology used on this page is defined on the rules page.) At a later date we will post more complex We outline the basic strategies and then show how they are applied inĪ sample puzzle. The third is to consider the total value of a region.

The second is to consider the different ways that a sum can beĬreated. The first is to use the strategies for solving regular sudoku puzzles. There are three basic methods used to solving killer sudoku puzzles. More advanced example based on weekly 183 Killer Sudoku Solving Strategies.A daily (#1271) is easier than it looks.More advanced example based on weekly 74.More advanced example based on weekly 28.More advanced example based on weekly 24.

Sudoku solving techniques