Well, a Nurikabe variation actually. The two squares with crosses must be of different colours.
This is a punishing puzzle, with no pleasant path to solution. So, why publish? Because I can use it to win an argument with a friend.
Consecutive Circles Sudoku by Bill Murphy
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(This post is part of the Genuinely Approachable Sudoku (GAS) series.) In a
Consecutive Circles Sudoku, each circumference contains a sequence of
digits ...
6 hours ago