In each of the 4x4 grids, place exactly 4 of the digits from 1 to 9, such that digits do not repeat in the 2x2 regions. Digits may not repeat in a row or column of the full 8x8 grid.
Each purple line contains a set of consecutive and non-repeating digits, in any order.
Digits on arrows must sum to the digit in the circle.Neighboring digits on a green line must differ by at least 5.
In cages, digits must sum to the number in the top left corner of the cage. Digits cannot repeat within a cage.