Mean Owl
The brief
- Each of the digits 1-9 must appear once in every row and column, and also in one of the nine large circles.
- Each large circle gives the exact average (the mean) of its coloured region.
- The small black dot connects two digits with a 1:2 ratio (one is double the other.)
- The small yellow dot connects two digits that have a total greater than 5.
- Small purple dots connect two digits that sum to a prime number.
- Not all possible dots are given.