Theme: Digit Series and Clue Symmetry
Author/Opus: This is the 227th puzzle from Thomas Snyder, aka Dr. Sudoku.
Rules: Standard Sudoku rules. Additionally, some numbered arrows outside the grid indicate the sum of the digits along that diagonal path. (Digits can repeat along a diagonal sum.)
Note: No answer strings or timing here (honor system for when you solve it). I’m simply posting some “examples” I wrote as the Sudoku Grand Prix coordinator. Apparently some common variants aren’t common enough….