Samurai Sudoku - kind of Sudoku puzzles. The playing field consists of five squares measuring 9 x 9. The numbers 1 to 9 must be placed correctly in all five squares.

Place 1 to 9 once each into every row.
Place 1 to 9 once each into every column.
Place 1 to 9 once each into every bold-lined 3x3 box.