Milestones

Normal sudoku rules apply

Divide the grid into grey and orange regions. A region is a group of orthogonally connected cells of the same colour. No 2x2 area may be all one colour. Two regions of the same colour may not touch diagonally.

MILESTONES: A digit on an arrow cell indicates how many cells you have to travel in the indicated direction until you reach a cell of the opposite colour. Eg: if an orange arrow cell contains a 1 then the neighbouring cell in the direction of the arrow would be grey.

DUTCH WHISPERS: Two orthogonally adjacent orange cells must have a difference of at least 4.

REGION SIZE CLUES: A small clue indicates the number of cells in the region.

BALANCED CAGES: In a cage, the sum of orange digits must equal the sum of grey digits. Digits MAY repeat in a cage if allowed by sudoku.