Normal sudoku rules apply.
• The digits X and Y in a cage (reading left to right) form a pair of coordinates that point to Row X, Column Y (rXcY).
• The digit at rXcY is determined as follows:
1. If X or Y is in the entropic set:
{1,2,3}, it represents the base-3 digit 0,
{4,5,6}, it represents the base-3 digit 1,
{7,8,9}, it represents the base-3 digit 2.
2. The entropic base-3 representations of X and Y now form a 2 digit base-3 number (reading left to right still).
3. Convert this number back to base-10, and place this digit at rXcY.
Example: [X=4, Y=8]. X is in the set {4,5,6}, so it represents a 1 in base-3. Y is in the set {7,8,9} so it represents a 2 in base-3. The new base-3 number is 12. Convert back to base-10: (1 x 3) + (2 x 1) = 5. Therefore we place a 5 in row 4, column 8.
• No two cage coordinates point to the same cell.
NEGATIVE DIAGONAL: Digits do not repeat along the negative diagonal (blue line).
GERMAN WHISPER: Adjacent digits on a green line differ by at least 5.
DUTCH WHISPER: Adjacent digits on an orange line differ by at least 4.
KILLER CAGE: If a cage has a small number in the top left, the digits in that cage sum to that number.
KROPKI DOTS: Digits either side of a white dot are consecutive. Digits either side of a black dot are in a 1:2 ratio (one is double the other).
XV: Digits either side of an X sum to 10. Digits either side of a V sum to 5.
GREY SQUARE: A digit on a grey square is even.