42- Palindrome Sudoku

Palindrome Sudoku

(Czech Republic Puzzle Championship 2014 (Sudoku Round))

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box. The digits in the squares with the line form palindromes, i.e. they are read evenly from both sides.

41- Untouchable Sudoku

Untouchable Sudoku

(Czech Republic Puzzle Championship 2014 (Sudoku Round))

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box. The same digits can't touch in the corners.

40- XV Sudoku

XV Sudoku

(Czech Republic Puzzle Championship 2014 (Sudoku Round))

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box. All adjacent cells with two digits summing to 5 are marked by V, while those summing to 10 are marked by X. The cells edges which do not contain a V or an X cannot have digits summing to 5 or 10.

39- Greater Than Sudoku

Greater Than Sudoku

(Czech Republic Puzzle Championship 2014 (Sudoku Round))

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box. There are given symbols of ‘greater than’ (>) or ‘less than’ (<) on the common line of the two adjacent cells.

38- Arrow Sudoku

Arrow Sudoku

(Czech Republic Puzzle Championship 2014 (Sudoku Round))

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box. The number in a circle is the sum of the digits which are covered by its arrow.

37- Antiknight Sudoku

Antiknight Sudoku

(Czech Republic Puzzle Championship 2014 (Sudoku Round))

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box. The same numbers are not chess-knight move connected.

36- Windoku

Windoku

(Czech Republic Puzzle Championship 2014 (Sudoku Round))

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 3x3 boxes. Moreover, coloured squares contain the digits 1 to 9 too.

35- Non-Consecutive Sudoku

Non-Consecutive Sudoku

(Czech Republic Puzzle Championship 2014 (Sudoku Round))

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box.  No numbers in vertically or horizontally adjacent cells will be consecutive numbers.

34- Consecutive Sudoku

Consecutive Sudoku

(Czech Republic Puzzle Championship 2014 (Sudoku Round))

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box. All two adjacent cells that have a small circle between them are consecutive in value.

33- Diagonal Sudoku

Diagonal Sudoku

(Czech Republic Puzzle Championship 2014 (Sudoku Round))

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, 3x3 boxes, and two main diagonals.

32- Jigsaw Sudoku

Jigsaw Sudoku

(Czech Republic Puzzle Championship 2014 (Sudoku Round))

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 irregularly shaped regions.

31- Classic Sudoku

Classic Sudoku

(Czech Republic Puzzle Championship 2014 (Sudoku Round))

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box.

30- Classic Sudoku

Classic Sudoku

(Czech Republic Puzzle Championship 2014 (Sudoku Round))

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box.

29- Classic Sudoku

Classic Sudoku

(Czech Republic Puzzle Championship 2014 (Sudoku Round))

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box.

28- Classic Sudoku

Classic Sudoku

(Czech Republic Puzzle Championship 2014 (Sudoku Round))

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box.

27- Inequality Sudoku

Inequality Sudoku

(LMI Beginners' Sudoku Test - February 2014)

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box. There are given symbols of ‘greater than’ (>) or ‘less than’ (<) on the common line of the two adjacent cells.

26- Arrow Sudoku

Arrow Sudoku

(LMI Beginners' Sudoku Test - February 2014)

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box. The number in a circle is the sum of the digits which are covered by its arrow.

25- Kropki Sudoku

Kropki Sudoku

(LMI Beginners' Sudoku Test - February 2014)

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box. The white dots indicate all the adjacent/neighboring cells in which the difference between the two cells is 1. The black dots indicate all the adjacent cells in which one digit is the double of the other one. The dot between two cells with digits 1 and 2 has any of these two colors.

24- Anti-knight Sudoku

Anti-knight Sudoku

(LMI Beginners' Sudoku Test - February 2014)

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box. The same numbers are not chess-knight move connected.

23- Classic Sudoku

Classic Sudoku

(LMI Beginners' Sudoku Test - February 2014)

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box.

22- Classic Sudoku

Classic Sudoku

(LMI Beginners' Sudoku Test - February 2014)

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box.

21- Classic Sudoku

Classic Sudoku

(LMI Beginners' Sudoku Test - February 2014)

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box.

20- Classic Sudoku

Classic Sudoku

(LMI Beginners' Sudoku Test - February 2014)

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each row, column and 3x3 box.

19- Multiple Solutions Sudoku

Multiple Solutions Sudoku

This puzzle has multiple solutions, you have to find the only digit that can be placed with absolute certainty.

18- XV Sudoku

  XV Sudoku
(Published on SudokuCup.com)

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 3x3 boxes. All adjacent cells with two digits summing to 5 are marked by V, while those summing to 10 are marked by X. The cells edges which do not contain a V or an X cannot have digits summing to 5 or 10.

17- Skyscrapers

Skyscrapers

(Published in Czech Republic Academic Championship)

Write a single number from 1 to 9 in each cell such that each number appears exactly once in every row, column and bolded 3x3 box. The numbers outside the grid means how many skyscrapers are seen from that direction of particular row or column (higher skyscrapers cover lower ones behind them).

16- Mathdoku

Mathdoku

(Published in Czech Republic Academic Championship)

Write a single number from 1 to 9 in each cell such that each number appears exactly once in every row, column and bolded 3x3 box. For more, in each of nine nonets (3x3 squares) there are subsidiary numbers between two cells. These numbers are the results of binary operations (addition, subtraction, multiplication, or division) between the two cells. In each nonet there must be used all the four binary operations.