This is a Wittgenstein Briquet puzzle.
July 31, 2016
July 20, 2016
This is a Nurikabe Pairs puzzle. This variation was created by Palmer Mebane.
Rules, with the change that every region of unfilled cells must contain exactly two numbers (instead of one) and have total size equal to the sum of the two numbers. (rules taken from Palmer Mebane's blog)