The first sudokus published in Dell Pencil Puzzles & Word Games (1979) were exemples of this sudoku variant. Here a puzzle created by me.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Each of the numbers in circles below goes into one of the circle boxes in the diagram (not necessarily in the order given).

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Each set of 4 small digits stands for the number in the four adjacent cells to this set.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Each number inside the blue cells must be no larger than the number of blue cells in its 3x3 block - the same as the given within that block. Each major diagonal also contains the numbers 1-9. Note that the 9 givens make a magic square.

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. Taking 180-degree rotational symmetry, the sum of mirrored skyscrapers must be 10.

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. There are no neighbouring houses with consecutive skyscraper heights. The clues along the edges tell you how many Skyscrapers you can see from that vantage point.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 8 and a chess king. Kings can be neither orthogonally nor diagonally adjazent.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 8 or a chess piece (1 queen and 8 knights). No chess pieces attack each other.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The same numbers are not "chess-knight move connected".

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 7 and two chess knights. No knights attack each other.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 7 and two chess knights. All knights defend at least one other.