PUZZLE NO. 82 : Odd Even Bridge Sudoku

RULES : Classic sudoku rules apply. Some circled cells are connected by a bridge.
               An odd digit in a circle equals the number of odd digits on the bridge. An even digit in a circle equals the number of even digits on the bridge.
               The digits on the circle are not counted.
               Also, it is possible for digits in both circles on a bridge to have the same parity.

PUZZLE NO. 81 : 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 box.

PUZZLE NO. 80 : Consecutive Sudoku

A Consecutive Sudoku with only one given number

RULES : Classic sudoku rules apply. Orthogonally adjacent cells containing consecutive numbers are separated by white dots. All possible dots are marked. 

PUZZLE NO. 79 : Kropki Sudoku

RULES : Classic sudoku rules apply. Additionally, if the absolute difference between two digits in neighbouring 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 neighbouring 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 marked.  

PUZZLE NO. 78 : Star Battle Sudoku

A Hybrid of Star Battle Puzzle and Classic Sudoku

RULES : Classic sudoku rules apply with the digits 1-7 and two stars to be placed in each row, column, and bold region. As in Star Battle puzzles, the stars cannot be placed in neighboring cells, including diagonally adjacent cells.

PUZZLE NO. 77 : Arrow Sudoku

RULES : Classic sudoku rules apply. Additionally, 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.

PUZZLE NO. 76 : Triple Sum Sudoku

Triple Sum Sudoku for GP practice

RULES : Each row is divided into 3 parts. The 1st part is a 4-digit number, the 2nd part (shaded) is a 3-digit number and the 3rd part is a 2-digit number. The sum of these three numbers is given outside the grid in the corresponding row. 

PUZZLE NO. 75 : Fortress Sudoku

A Fortress Sudoku for GP practice

RULES : Classic sudoku rules apply. Additionally, there are some grey cells in the grid. Digits in the grey cells are larger than all orthogonally ( horizontally & vertically ) adjacent white cells.

PUZZLE NO. 74 : Thermo Sudoku

A Thermo Sudoku for GP practice

RULES : Classic sudoku rules apply. Additionally, there are some thermometer shapes in the grid. The numbers are in increasing order from the bulb to the flat end on each thermometer.

PUZZLE NO. 73 : Rossini Sudoku

Another Variant for practice for Sudoku GP ( Indian Round )

RULES : Classic sudoku rules apply. The arrows outside the grid indicate that the first three digits are in ascending or descending order ( the highest digit is at the sharp end of the arrow ). If there is no arrow outside, the first three digits cannot be in either ascending or descending order.
Note : This sudoku featured on the youtube channel Cracking The Cryptic. The link to the video can be found here A New Puzzle Type for you

PUZZLE NO. 72 : Three Lines Sudoku

This is a practice puzzle for Sudoku GP ( Indian Round ) to be held this weekend. I am co-authoring this round along with Gaurav K. Jain, Hemant Malani, R. Kumaresan, Rakesh Rai, Pranav Kamesh & Prasanna Venkatesh Seshadri.

RULES : Classic sudoku rules apply. In each group of three lines :

• One will follow Arrow Sudoku rules. The digit placed in a cell with a circle must be the sum of the digits placed in the cells that the adjoining arrow passes through. Digits may repeat on arrows. It is up to the solver to determine which end has the circle.
• One will follow Thermo Sudoku rules. Starting at the bulb, digits placed along the thermometer must form a strictly increasing sequence. It is up to the solver to determine which end has the bulb.
• One will follow Palindrome Sudoku rules. Digits along the line read the same in both directions.

         It is allowed that a line has properties of both Arrow and Thermo Sudoku ( for instance : 1-2-3-6 ).

PUZZLE NO. 71 : Sum Sandwich Sudoku

RULES : Classic sudoku rules apply. Additionally, the clues outside the grid represent the sums of the numbers sandwitched between the 1 and the 9 in that row or column.

PUZZLE NO. 70 : Kropki Sudoku

A Kropki Sudoku with only white dots

RULES : Classic sudoku rules apply. Additionally, if the absolute difference between two digits in neighbouring 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 neighbouring 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 marked.

PUZZLE NO. 69 : Kropki Sudoku

Rules : Classic sudoku rules apply. Additionally, if the absolute difference between two digits in neighbouring 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 neighbouring 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 marked.

PUZZLE NO. 68 : Kropki Sudoku

RULES : Classic sudoku rules apply. Additionally, if the absolute difference between two digits in neighbouring 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 neighbouring 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 marked.

PUZZLE NO. 67 : Average Sudoku

RULES : Classic sudoku rules apply. If the number in a cell equals the average of its two horizontal neighbours, then the cell is marked with a horizontal line. If the number in a cell equals the average of its two vertical neighbours, then the cell is marked with a vertical line. All possible lines are marked.

PUZZLE NO. 66 : XV Sudoku

RULES : Classic sudoku rules apply. If the sum of digits in orthogonally adjacent cells is 10, then they are seperated by X. If the sum of digits in orthogonally adjacent cells is 5, they are seperated by V. All possible X and V are marked.

PUZZLE NO. 65 : LINKED SUDOKU

RULES : Classic sudoku rules apply to each of the grids. Both the grids are linked to each other. The shaded cells must contain same digit in both the grids.

PUZZLE NO. 64 : UNTOUCH 2/2 SUDOKU

RULES : Classic sudoku rules apply. Diagonally adjacent numbers cannot be half or double of each other.

PUZZLE NO. 63 : ODD EVEN SUDOKU

RULES : Classic sudoku rules apply. Additionally, cells having grey circles will contain only odd digits. Cells having grey squares will contain only even digits.

PUZZLE NO. 62 : IRREGULAR 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 outlined region. Each outlined region is marked by thick borders.

PUZZLE NO. 61 : FORTRESS SUDOKU

RULES : Classic sudoku rules apply. Additionally, there are some grey cells in the grid. Digits in the grey cells are larger than all orthogonally ( horizontally & vertically ) adjacent white cells.

PUZZLE NO. 60 : OVERLAPPING SUDOKU

RULES : Classic sudoku rules apply to each grid. Some grids are overlapping.

PUZZLE NO. 59 : GREATER NEIGHBOURS SUDOKU

I had created this variant for the Puzzle Innovation Contest in WSC 2017. Sharing it on my blog.

RULES : Classic sudoku rules apply. Some cells are marked with circles. All orthogonal ( vertical & horizontal ) neighbours of circled cells will have numbers greater than the number in the circled cell. All possible circles are marked.

PUZZLE NO. 58 : ODD SUDOKU

RULES : Classic sudoku rules apply. Additionally, cells having grey circles will contain only odd digits.

PUZZLE NO. 57 : EVEN SUDOKU

RULES : Classic sudoku rules apply. Additionally, cells having grey squares will contain only even digits.

PUZZLE NO. 56 : ODD EVEN SUDOKU

RULES : Classic sudoku rules apply. Additionally , cells having grey circles will contain only odd digits . Cells having grey squares will contain only even digits.

PUZZLE NO. 55 : EXPANDED SUDOKU

RULES : Classic sudoku rules apply. There are some gaps in the grid.

PUZZLE NO. 54 : ARROW SUDOKU

A numberless Arrow Sudoku

RULES : Classic sudoku rules apply. Additionally , 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.

PUZZLE NO. 53 : X SUMS SUDOKU

An X Sums Sudoku for SM practice. 

RULES : Classic sudoku rules apply. Additionally , the clues outside the grid indicate the sum of the first X numbers placed in the corresponding direction , where X is equal to the first number placed in that direction.

PUZZLE NO. 52 : DIVISION SUDOKU

A Division Sudoku for SM practice

RULES : Classic sudoku rules apply. Additionally , the circled number between two cells indicates the quotient when the larger digit is divided by the smaller digit. The remainder must be zero.

PUZZLE NO. 51 : EXTRA REGIONS SUDOKU

RULES : Classic sudoku rules apply. Additionally , each group of nine coloured cells must also contain the numbers 1 to 9.

PUZZLE NO. 50 : CONSECUTIVE PAIRS SUDOKU

This was my submission for www.gmpuzzles.com. It was not accepted because Thomas found it extremely difficult. Give it a try guys.

RULES: Classic sudoku rules apply. If a grey circle is given between two adjacent cells , then the numbers in those cells will be consecutive. Not all grey circles are given , which means adjacent cells without a grey circle may or may not contain consecutive digits

PUZZLE NO. 49 : SEARCH 9 SUDOKU

Search 9 sudoku is normally considered as one of the most difficult variants. I have tried to keep the difficulty level in check so that it can be solved by the normal solvers as well.

RULES : Classic sudoku rules apply. Additionally , each arrow points to the 9 in the respective row or column. The number in the cell with the arrow is the distance from the cell to the 9 in the respective row or column.

PUZZLE NO. 48 : SERBIAN FRAME SUDOKU

A Serbian Frame sudoku for Sudoku Mahabharat 4th round practice.

RULES : Classic sudoku rules apply. Additionally , the clues outside the rows indicate the sum of the numbers to be placed in the 2nd and 3rd cells in the corresponding directions. The clues outside the columns indicate the sum of the numbers to be placed in the 3rd and 4th cells in the corresponding directions.