I got to this state of the daily killer sudoku rather quickly, but I've been stuck on this state for an hour now. What am I missing? How do I proceed? :
Sudoku #1 More Insane Sudoku Puzzles by KrazyDad, Book 58
Killer Sudoku (Logikrätsel, Zahlenrätsel)
Killer Sudoku Puzzles by Krazydad
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Brutalism (Killer Sudoku X) — Rätselportal — Logic Masters Deutschland