Normal sudoku rules apply, and the grid divides fully into polyominos, each containing one circle and no repeated digits. The circle digit indicates the number of cells in that polyomino. White boxes separate adjacent, consecutive digits that share a polyomino. Black boxes separate adjacent numbers with a 1:2 ratio that are in different polyominos. All such boxes of both types are given. Three of the polyominos have been filled in, including the unique largest and the unique smallest.