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.