This is a certain indicator of hardness of the puzzle. Having said that, it cannot be denied that this puzzle needed more concentration till final solution. No new technique needed to be used in solving this puzzle. To be honest, we cannot say this first 4th level Sudoku puzzle is harder than all the 3rd level puzzles we have solved. Self-learning by pattern discovery is a key to solving harder problems. This lies at the heart of problem solving. Mind you, that is all by self-learning-by patient search for new digit patterns and creating a new technique. In fact, by solving the third levels puzzles we have discovered a host of new digit patterns that helped to create powerful techniques. ![]() In the same way, our 3rd level puzzles solved surely are more difficult than the 2nd level puzzles. Then what about the hardness levels of our puzzles that we have solved and explained till now? One thing we may say is-surely the 2nd level puzzles are more difficult than the 1st beginner level ones. There is no simple generally accepted criterion that determines the hardness level of a Sudoku puzzle as there are no well-defined hardness levels in the first place. To skip the next section on a few words on hard Sudoku puzzles click here. Sudoku hard level 4 game 2 Solution - Sudoku techniques highlighted.Sudoku hard technique of parallel scan for a single digit on a row or a column.Sudoku hard technique of double digit scan.Sudoku advanced technique:Single digit lock - how to identify and use for a breakthrough.Enumerating digits possible (DSs) for empty cells.How to identify and use a Cycle of two or three digits for simplifying Sudoku puzzles.Digit subset analysis (DSA) to find single digit candidate AND digits possible (DS).Sudoku basic technique - Row column scan to find single digit candidate for a cell.This is second Sudoku hard game at level 4. Sudoku Techniques - How to Solve Sudoku hard level 4 game 2 explains Sudoku techniques DSA, Cycle, Single digit lock and more. How to solve Sudoku hard level 4 game 2 by Sudoku techniques
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