How to solve a Surveyors Heyawake puzzle?

This excellent Surveyors Heyawake puzzle by Ivan Koswara from 25years contest will make you sweat till the end SURVEYORS HEYAWAKE Shade some cells black. No two black cells share a side. All white cells form a single contiguous area. No horizontal/ vertical line of white cells spans across more than two rooms. (All rooms will be rectangular.) Within each room containing numbers, one number behaves as a Heyawake clue: it counts the number of black cells in the room. All other numbers behave as Minesweeper clues: each counts the number of black cells among the cell itself and (up to eight) surrounding cells. (In a room, there may be several numbers that end up all equal to the number of black cells in the room. Only one can be counted as a Heyawake clue; all others must also be Minesweeper clues. It is not necessary to mark which clues are the Heyawake ones. Hello Everyone ! Welcome to this youtube channel : "Unshackling Sudokus & Puzzles " #puzzles #sudokus #brainteasers #Heyawake This video covers a Heyawake variant. Video is taken by Ashish kumar one of the finest Authors for both Sudoku and puzzles. He has authored many international championships including World Sudoku and Puzzle Championship. Link to the Online Solving :
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