Fill the grid with the digits 1 to 9. Each row, column, 3x3-box and both diagonals have exactly one of each digit. The numbers tell you the sum of the marked cages. The coloured points tell you whether the sums in the marked cages are odd (yellow point) or even (green point). In cages there can't be the same digit repeated.

Fill in the grid so that every row, every column, every 3x3 box and both diagonals contain the digits 1 through 9. A red arrow means that the digits are going up till they hit this number and for a cyan arrow they go down till they hit this particular number.

For example:

135247896 could get a red arrow with a 5 or a cyan arrow with a 1.

932415678 could get a red arrow with a 9 or a cyan arrow with a 2.

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 the grid with the digits 1 to 9. Each row, column, 3x3-box and diagonal will have exactly one of each digit. In green cells can only be even digits. In yellow cells can only be odd digits. If two orthogonally or diagonally cells are connected with a red line then the numbers in these cells are consecutive.

Fill in the grid so that every row, every column, every 3 x 3 box and both diagonals contain the digits 1 through 9. There are no neighbouring cells with consecutive digits in rows or columns.

Fill in the grid so that every row, 9-cell-diagonal, and 3x3 box contains the digits 1 through 9. In the shorter diagonals all digits must be different.

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column, 3x3-box and marked diagonal has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point.

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.

Fill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different.

Fill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different.