Author/Opus: This is the 287th puzzle from our managing editor Serkan Yürekli.
Rules: Variation of Kakuro. The gray (2×2) cells are to be filled by a single digit which sits in multiple rows and columns. No digits can repeat within an entry, regardless of if it is in a small or large cell.
Difficulty: 4.5 stars
Time Standards (highlight to view): Grandmaster = 11:00, Master = 15:30, Expert = 31:00