Logic Masters Deutschland e.V.

In December 2021 there was a logic puzzle advent calender on mathebau.rocks, containing variants of standard puzzles. These puzzles are now uploaded to the puzzle portal.

13. Dezember - Cave

Rules: Blacken some cells, such that all white cells are (orthogonally) connected and no numbers are blackened. Furthermore, all black cells have to be (orthogonally) connected to the border of the grid.
Clues indicate the product of the amount of seen cells in the row with the amount of seen cells in the column. Visible are all cells (starting with the clue cell) until one reaches the next black cell or the border. The clue cell itself has to be counted as well (in both directions).

Link for online solving