Smashed Sums by Grant Fikes
or solve online (using our beta test of Penpa-Edit tools; use tab to shift between number entry and shading modes.)
Theme: Squared Away
Author/Opus: This is the 382nd puzzle from our contributing puzzlemaster Grant Fikes.
Rules: Fill each row and column of the grid with the digits 1 to 4 and two blackened cells. Numbers outside the grid indicate the sum of the digits between the two blackened cells in that row or column. Blackened cells are allowed to touch. Or see here.
Difficulty: 1.5 stars
Time Standards (highlight to view): Grandmaster = 1:00, Master = 1:30, Expert = 3:00
Solution: PDF and solving video.
Note: Follow this link for other less common Number Placement puzzles.