Place the digits 0-9 once each into every row, column and 2x2 box. Cells may contain up to four digits simultaneously, and cells in the same row/column/box may not contain the same number of digits. A cell's value is the sum of the digits it contains. Values separated by a white dot are consecutive. Values separated by a black dot are in a 1:2 ratio. Values separated by an X sum to 10.