Normal sudoku rules apply. Digits along an arrow sum to the digit in that arrow’s circle. Shade some cells in the grid such that they form an orthogonally connected area. All unshaded cells must be part of an orthogonally connected group that contains all the digits 1 to N exactly once, where N is the size of that group. All groups must be connected to the outside of the grid. All circles (including arrow bulbs) are unshaded.