Prime Directive
- Kropki dots
- Odd and even cells
The brief
Normal Sudoku rules apply. Numbers in circles and pills are each a UNIQUE prime number from the following list: 2, 3, 5, 7, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97. Cells with a gray circle are odd. Cells with a gray square are even. KROPKI PAIR- Numbers with a black dot between them are in a ratio of 2:1. Not all possible dots are shown. HINT: Count the digits.