or solve online (using our beta test of Penpa-Edit tools; use tab to shift between number entry and shading modes.)
Theme: For 08/03/21
Author/Opus: This is the 388th puzzle from Thomas Snyder, aka Dr. Sudoku.
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: 2 stars
Time Standards (highlight to view): Grandmaster = 2:00, Master = 3:00, Expert = 6:00
Note: Follow this link for other less common Number Placement puzzles.