Very hard Sudoku level 4 game 24 solved by test of linked pairs of locked digit chains resulting in conflict of same digit in two cells of same column.
Very hard Sudoku level 4 game 23 solved by test of linked pairs of locked digit chains resulting in conflict of same digit in two cells of same column.
Very hard Sudoku level 4 game 22 solved by analysis of linked pairs of locked digit resulting in conflict of same digit in two cells of same column.
Very hard Sudoku level 4 game 21 is solved step by step using valid diagonal test of an asymmetric X wing digit formation for easy understanding.
Very hard Sudoku level 4 game 20 is solved step by step using advanced Sudoku techniques and strategy so that it is easy to follow how to solve hard Sudoku.
Very hard Sudoku level 4 game 19 is solved step by step using advanced Sudoku techniques and strategy so that it is easy to follow how to solve hard Sudoku.
Breakthroughs by advanced Sudoku techniques and each valid cell details explained in the four stage solution to the hard Sudoku puzzle level 4 game 18.
Important breakthroughs by advanced Sudoku techniques and valid cell details in solving the Sudoku hard puzzle level 4 game 17 are explained in four stages.
Difficult breakthroughs as well as finding each valid cell when solving the Sudoku hard puzzle level 4 game 16 both are explained clearly in four stages.
Solving Sudoku Hard Puzzles: Level 4 Game 15 quick solution by early breakthroughs using advanced Sudoku techniques. All steps explained.
