Normal sudoku rules apply. Across the white dot the two digits are consecutive. Some orthogonally adjacent cells are separated by birds. Each bird indicates a specific ratio. All pairs of digits on the same kind of bird are in an equal ratio eg. a pelican might lie between pairs of digits that share a 3:4 ratio. If so, the ornithologically related pairs across pelicans would be 3:4, 6:8, 4:3, and 8:6. Not all possible birds are given.
If you prefer to play directly in sudokupad then click below.
