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 suggested in the comments below with centralized digit entry is here.)
Theme: Circular Reasoning
Author/Opus: This is the 342nd 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.
Difficulty: 1.5 stars
Time Standards (highlight to view): Grandmaster = 0:50, Master = 1:45, Expert = 3:30