Fill in the grid so that every row and every column 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, 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 the grid with the digits 1 to 9. Each row, column and 3x3-box has exactly one of each digit. The top of the pencil is one digit higher as the other digit of the pencil.

Fill in the grid so that every row and every column contains the digits 1 through 5. Numbers must be placed according to greater (>) and less (<) signs. The numbers between two cells give the difference of the digits.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Some rows and columns have numbers. They represent the difference of the two ends.

Fill in the grid the digits 0 through 9. There are no cells with a common line and consecutive digits. (0 is consecutive with 1, not with 9.)

Fill in the grid so that every ring and every pair of neighboured circle segments contains the digits 1 through 8. There are no neighbouring cells with consecutive digits.

Fill in the grid so that every ring, spoke and 3x3 box contains the digits 1 through 9. There are no neighbouring cells with consecutive digits.