Double Kakuro by Grant Fikes
or solve online (using our beta test of Penpa-Edit tools; note that the dotted circles are just for answer entry and are where the number should be placed in the 2×2 cell. An alternate option with centralized digit entry is here.)
Theme: Pattern
Author/Opus: This is the 274th puzzle from our contributing puzzlemaster Grant Fikes.
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 and then the marked column from top to bottom, separating the groups with a comma.
Time Standards (highlight to view): Grandmaster = 4:00, Master = 5:30, Expert = 11:00
Solution: PDF
Note: Follow this link for other Kakuro puzzles. More Kakuro puzzles can be found in Kakuro and Variations by Serkan Yürekli. Kakuro will also (eventually) be featured in The Art of Puzzles 2.