09- Antidiagonal Twin Detector Sudoku

Antidiagonal Twin Detector Sudoku
(Published in Czech Republic Championship)

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. Wherever the number in the cell equals to a total of any amount of the closest numbers in any direction - there is an arrow pointing to that direction. Moreover on each marked main diagonal there are exactly three different digits.

08- Consecutive Sudoku

Consecutive Sudoku
(Published in Daily League! The League of Extraordinary Ladies and Gentlemen & 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 row, column and 3x3 box. All two adjacent cells that have a small circle between them are consecutive in value.

07- Queens

  Queens
(Published in Czech Republic Championship)

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

digits 9 represent chess queens, these queens do not attack each other.