Puzzle No. 428: Lockout Lines Sudoku

 

RULES: Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box. 

Endpoints (Diamonds) must differ by at least 4. Digits on the line must be different than the endpoint values and must not fall between them. Each Lockout segment is treated as an independent Lockout Line. Digits can repeat if allowed by other rules.

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Puzzle No. 427: Classic Sudoku

 

RULES: Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box. 

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Puzzle No. 426: Arrow Sudoku

RULES: Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box. 

There are some arrow shapes in the grid. The sum of the digits along the path of each arrow must equal the digit in the circled cell. Digits may repeat along an arrow. 

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Puzzle No. 425: Classic Sudoku

 

RULES: Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box. 

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Puzzle No. 424: Arrow Sudoku

 

RULES: Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box. 

There are some arrow shapes in the grid. The sum of the digits along the path of each arrow must equal the digit in the circled cell. Digits may repeat along an arrow. 

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Puzzle No. 423: Little Killer-X Sums Hybrid Sudoku

 

RULES: Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box. 

Numbers with arrows outside the grid indicate the sum of the digits appearing in the cells in the corresponding direction. Digits may repeat in the direction of the arrow.

The clues outside the grid indicate the sum of the first X digits placed in the corresponding direction, where X is equal to the first digit placed in that direction. 

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Puzzle No. 422: One or Two Difference Pairs Sudoku

 

RULES: Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box. 

If a circle is given between two adjacent cells, then the difference in those cells must be 1 or 2. Not all circles are given. 

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Puzzle No. 421: Quad Max Sudoku

 

RULES: Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box. 

The digit pointed by each arrow must be larger than the other three digits that the arrow touches.

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Puzzle No. 420: Odd Even Count Sudoku

RULES: Place a digit from 1 to 9 into each empty cell in the grid so that each digit appears exactly once in each row, column and 3x3 outlined box.

The digit in each circled cell is the number of digits in the 8 surrounding cells that have the same parity (odd/even) as that digit.

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Puzzle No. 419: Renban-Kropki Pairs Hybrid Sudoku 6x6

RULES: Place a digit from 1 to 6 in each empty cell so that each digit appears exactly once in each row, column and 2x3 outlined box.

Each purple line contains consecutive digits, in any order.

If the absolute difference between two digits in neighboring cells equals 1, then they are separated by a white dot. If the digit in a cell is half or double of the digit in a neighboring cell, then they are separated by a black dot. The dot staying between 1 and 2 can have any of these dots. All possible dots are not marked.

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