Fill some cells in the grid with the digits 1-9 such that no digit repeats in a row or column and some cells are left empty. All empty cells in the grid must be orthogonally connected. All digits must belong to a region, which is an orthogonally connected group of 9 cells. Digits may not repeat in a region. Regions may not touch each other orthogonally. Clues outside the grid give the sum of the digits before the first empty cell seen from that direction. A digit in a circle indicates how many of the 8 surrounding cells are empty. A cell with a circle must contain a digit. Not all circles are necessarily given.