Cave (16)

Instruction:

Shade some cells to leave behind a single orthogonally-connected group - the cave - with no enclosed shaded cells. In other words, all shaded cells must be connected edge-wise by other shaded cells to an edge of the grid. All numbered cells must be a part of the cave, with each number indicating the total count of cells connected in line vertically and horizontally to the numbered cell including the cell itself.

Reference: WPF (1)

Examples:

WPF Puzzle GP 2014 - Round 2 (88)

WPF Puzzle GP 2014 - Round 3 (89)

WPF Puzzle GP 2014 - Round 6 (92)

WPF Puzzle GP 2015 - Playoffs (95)

WPF Puzzle GP 2015 - Round 5 (83)

WPF Puzzle GP 2016 - Round 4 Competitive (34)

WPF Puzzle GP 2016 - Round 5 Competitive (41)

WPF Puzzle GP 2017 - Round 4A (19)

WPF Puzzle GP 2017 - Round 4B (20)

WPF Puzzle GP 2017 - Round 7B (22)