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 the grid with digits 1 to 9, where in each row, every column and in each of the nine 3x3 boxes each digit occurs exactly once. The numbers in cells with an arrow occur in direction of the arrow exactly once.

Fill in the grid so that every row, every column and the 3x3 boxes contain the digits 1 through 9. All eight green lines must use no more then four digits. Each line must use three of these digits.

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. In the marked diagonals no digit can appear more then once. The clues along the edges tell you how many skyscrapers you can see from that vantage point.

Put the numbers 1 through 9 into the hexagonal cells so that every line (of any length) contains every digit not more than once. The lines must contain consecutive numbers, i. e., if a line has five cells there can be 2, 3, 4, 5, 6 or 3, 5, 4, 2, 6 but not 3, 4, 1, 9, 8 in the cells.

The clues along the edges tell you how many skyscrapers you can see from that vantage point in the given direction.

Locate the position of a 10-ship fleet in the grid. The shapes of the ships are shown to the right of the grid. There is one 4x1 battleship, two 3x1 cruisers, three 2x1 destroyers and 4 1x1 submarines. The numbers beside the grid indicate the number of cells occupied by ships in each row, while the numbers below the grid indicate the number of occupied cells in each column. Ships may touch the edge of the board, but cannot touch each other, not even diagonally. Additional each cell has a number from 1 to 9. Place the digits so that each digit appears exactly once in each of the rows, columns and the nine outlined 3x3 regions. Cells with ship parts can only contain even numbers.

* Today's picture shows a pyramid with a manger scene. Joseph has a Christmas Matins lantern in his hands. Lanterns of this type are used in the Erzgebirge on the way to Christma Matins on the morning of the 25th December.
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*The Erzgebirgian people celebrate Christmas Eve with a feast, the Neinerlaa (literally: nine different things). There are many rules surrounding the Neinerlaa. It would take too long to mention them all here. But the nine ingredients that gave the Neinerlaa the name have special meanings. The Griene Kließ (raw potato dumplings) will bring money, the lentils or the millet little money, the beetroot red cheeks (i.e. health), the root celery fertility, bread roll milk white clothes (i.e. order in the house). Also important, there must be animals on earth (sausage from the pig), in the air (goose) and in the water (now herring, formerly also carp).
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*When I decided to make a Neinerlaa puzzle, it quickly became clear there should be a sudoku, because there are nine rows, nine columns, nine boxes and nine numbers. The pioneering role of the components are symbolized in our puzzle by nine kinds of arrows. And to top this, there is sometimes a purple cell border if the sum of the neighboring cells is 9.
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One of the 9 ingredents of the Erzgebirgian christmas meal, called Neinerlaa, are Griene Kließ (Green Dumplings). The circles in our puzzle, an Hanidoku, look like these dumplings.

Put the numbers 1 through 9 into the hexagonal cells so that every line (of any length) contains every digit not more than once. The lines must contain consecutive numbers, i. e., if a line has five cells there can be 2, 3, 4, 5, 6 or 3, 5, 4, 2, 6 but not 3, 4, 1, 9, 8 in the cells.