Fill in the grid so that every row, every column and every 3x3 box contain the digits 1 through 9. Numbers outside the grid gives the position of the maximum of the first three digits.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. If a green and a white cell are orthogonally adjazent then the green cell has the greater value.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. If a green and a white cell are orthogonally adjazent then the green cell has the greater value.

Fill in the grid with the digits 1 to 9. Each row, column and 3x3-box will have exactly one of each digit. The clues along the egdes tell you in which cell you can find the maximum of the first three cells in the corresponding row or column.

Fill in the grid so that every row, every column, every 3x3 box and both diagonals contain the digits 1 through 9. Blue cells indicate the digit is lower than all it's orthogonally adjacent cells. Red cells are higher than all it's orthogonally adjacent cells. White cells indicate the digit is both higher and lower than it's orthogonally adjacents.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. Numbers must be placed according to greater (>) and less (<) signs.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. Numbers must be placed according to greater (>) and less (<) signs.

Fill in the grid so that every row, every column and every 3x3 box contains the digits 1 through 9. Numbers must be placed according to greater (>) and less (<) signs. The numbers between two cells give the difference of the digits.

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box will have exactly one of each digit. The red points in the near of crosses where four cells meet each other show that the cell with the red points is greater then the three other ones. The blue rings in the near of crosses where four cells meet each other show that the cell with the blue ring is smaller then the three other ones.

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box will have exactly one of each digit. The red points in the near of crosses where four cells meet each other show that the cell with the red points is greater then the three other ones.