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).