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Cave (Big Cells) (383)

Instruction:
Shade some cells to leave behind a single orthogonally-connected group — the cave — with no shaded cells enclosed within the cave. 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 (and therefore not shaded). Each number indicates the total count of cells connected in line vertically and horizontally to the numbered cell including the cell itself.
Some cells in the grid are larger than regular cells, and can span multiple rows or columns. For purposes of numbered cells and the answer key, a large cell counts as one cell even if only part of the cell is connected in line to the the numbered cell.

Reference: WPF (1)

Examples:
WPF Puzzle GP 2018 - Round 5 (55)
Parent puzzle:
Cave