Theme: Clue Symmetry and Logic
Author/Opus: This is the 4th puzzle from guest contributor Dan Katz.
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.
Answer String: Enter the values in each white/gray cell in the marked row from left to right then the marked column from top to bottom, separating the groups with a comma.
Time Standards (highlight to view): Grandmaster = 8:00, Master = 12:30, Expert = 25:00