Fill in the grid with the numbers 1 to 4. In each row and each column is each number exactly once. There are also in each row and column two blackened cells. The numbers on the edge give the sum of the squares between the two blackened fields in the row or column respectivly.

Smaller example with numbers 1 - 3:

Puzzle:

Fill in the grid with the numbers 1 to 4. In each row and each column is each number exactly once. There are also in each row and column two blackened cells. The numbers on the edge give the sum of the squares between the two blackened fields in the row or column respectivly.

Smaller example with numbers 1 - 3:

Puzzle:

Change some digits in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9 and so that no pair of changed digits is horizontal or vertical adjazent (diagonally adjazent changed cells are allowed).

Find a way that travels from dot to dot, horizontally and vertically only, and ends where it began, never touching or crossing itself. The numbers indicate the number of adjacent corners where the path bends 90 degrees.

Example:

Puzzle:

Draw a circular path on the grid line. Not all grid points must be used. But all the red and blue dots are on the path. The lengths of the edges of the path are 1 or 2. On a blue circle meet two lines of equal length each other with a right angle. At red circles two lines of different lengths meet each other with a right angle.

Example:

Puzzle:

Find a way that travels from dot to dot, horizontally and vertically only, and ends where it began, never touching or crossing itself. The numbers that have been placed in the diagram tell you how many of the four sides of the "square" it lies in are used for the path. (The path doesn't necesserily need to touch all of the dots.)

Fill the grid with numbers 1 through 9. In no row, column and none of the drawn diagonals is reapeated any number.

Smaller Example:

Puzzle:

Place numbers 1 to 4, each once, in only white cells of each row and column. Numbers in gray cells are sum of orthogonally adjazent white cells.

Puzzle:

Place the letters A, B and C in the grid. The letters on the edge are informations about the arrangement of the row or column. Repeated letters are given only as single letters. If a line is AABBA , then, for example, ABA is at the edge. The question marks indicate that we do not know which letter is at this place.

Example:

Puzzle:

Place the letters A, B and C in the grid. The letters on the edge are informations about the arrangement of the row or column. Repeated letters are given only as single letters. If a line is AABBA , then, for example, ABA is at the edge. The question marks indicate that we do not know which letter is at this place.

Example:

Puzzle: