Spider
- Kropki dots
- XV and number dots
- Thermometers
- Region sum lines
The brief
Normal sudoku rules apply.
Along thermometers, digits must increase from the bulb end.
Digits separated by a white dot must be consecutive. Digits separated by a black dot must be in a 1:2 ratio. Not all dots are given.
Digits along the blue line sum to the same value in each 3x3 box the line passes through.
Digits separated by an X must sum to 10.
The cell marked with an 'O' contains an odd digit.