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Eels (1059)

Instruction:
Shade some cells black and leave the remaining cells white so that the grid is divided into eels. An eel is a series of at least four cells of the same color (black or white) that touch orthogonally in sequence. Eels may not touch other eels of the same color along a cell edge. No eel may loop around to touch itself, not even diagonally. (In other words, if two cells in the same eel touch orthogonally, then they must be exactly one cell apart along the path of the eel, and if two cells in the eel touch diagonally, then they must be exactly two cells apart along the path of the eel.)
Inside some cells are numbers; each number must equal the area of the eel it belongs to. An eel may contain zero, one, or more of the numbered cells. Numbered cells may contain arrows pointing to orthogonally adjacent cells; the color of the arrow indicates whether you must shade the orthogonally-adjacent cell the arrow is pointing to. Numbered cells must be left white.

Reference: WPF (1)

Examples:
WPF Puzzle GP 2022 - Round 4 (184)