Fill in the grid so that every row, every column, and 5x3 box contains the letters A through O.

Fill in the grid so that every ring and every pair of neighboured circle segments contains the digits 1 through 8.

Fill in the grid so that every ring and cells of the same color contains the digits 1 through 8.

Fill in both grids so that every row, every column, and every 3x3 box contains the digits 1 through 9.

Fill in the grid so that every of the lines in the three marked directions and every circle contains the digits 1 through 6.

Fill in the grid so that every row and every column contains the digits 1 through 8. Each box contains two numbers.

Fill in the triangles around each circle the digits 1 to 6 so that each digit is only used once per circle.

Fill in the triangles around each circle the digits 1 to 6 so that each digit is only used once per circle.

Fill in the grid so that every row, every column, and every outlined region contains the digits 1 through 9.