Normal sudoku rules apply. Shade some cells in the grid such that all shaded cells are orthogonally connected. Within each 3x3 box, every separate orthogonally connected group of shaded cells must sum to N, where N is the same for all boxes. Circles can be shaded or unshaded, and the digit in a circle is the number of shaded cells in its 3x3 box. Squares are shaded, and the digit in a square is the number of shaded cells “seen” horizontally or vertically combined from that cell (including itself), where unshaded cells block vision. Diamonds are unshaded, and the digit in a diamond is the size of the orthogonally connected group of unshaded cells that it belongs to.