Horseshoe Crab
- Killer cages
- Kropki dots
- XV and number dots
The brief
Normal Sudoku rules apply. Numbers on blue lines sum to 20. Numbers in cages sum to the number in the top left corner of the cage. Where the number is blocked by a line, the number is repeated below for visibility. Numbers with a black dot between them are in a ratio of 2:1. Numbers with a V between them sum to 5. Not all possible dots and V are given.