Normal sudoku rules apply. In cages, digits do not repeat and sum to the number shown. There are 5 types of balls in the grid: A: 1 set of digits around it must sum to 10 B: 2 sets of digits around it must sum to 10 C: 1 set of digits around it must sum to 5 D: 2 sets of digits around it must sum to 5 E: 1 set of digits must sum to 5, 1 set of 2 digits must sum to 10 A ‘set of digits’ always contains 2 orthogonally connected digits. No digit is part of 2 sets on the same circle, but it may be part of sets on different circles. There are no negative constraints, so other pairs may add to 5 or 10 around circles or elsewhere.