Normal sudoku rules apply. Entering enough correct digits in cells will reveal more of the puzzle – no guessing is required. A pair of 2-digit numbers read from left to right are circled. This pair of numbers must add to 90. Each time the fog clears, another pair will appear - each time summing to 90. Digits in a cage must sum to the total given in the cage’s upper left corner. Digits on a purple “Renban” line form a set of consecutive numbers. Any three adjacent digits on a teal “Modular” line must include one digit from each of the sets {147}, {258}, {369}. Any two adjacent cells on a green German Whisper line have a difference of at least 5. Cells separated by a white dot have a difference of 1.