Quadruple sudoku

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3x3 regions.

Each set of four digits in the intersection of two lines indicates the digits that have to be placed in the four adjacent cells.

Sudokus that no one can solve

Sudokus that no one can solve, not only including Sudokus which are very difficult but also those that no one has tried to solve.

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Sudokus with no one can solve

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Quadruple sudoku

Hybrid Sudoku ( X Sums + Consecutive )

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Consecutive Sudoku

Greater Than Kropki Sudoku

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Consecutive Sudoku

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MiniMax Sudoku

XV Sudoku

Count different Sudoku

Hybrid Sudoku ( X Sums + Greater Than )

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Hybrid Sudoku ( Greater Than + Sum Frame )

Maximin Sudoku

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Quadruple sudoku

Sudokus that no one can solve