Diagonal Sequence Lines Sudoku by Philip Newman
(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
You know that feeling when everything falls neatly into place? You might just experience that with this Diagonal Sequence Lines Sudoku.

or solve online (using SudokuPad)
Theme: That Feeling Won
Author/Opus: This is the 122nd puzzle from Philip Newman, part of the Genuinely Approachable Sudoku (GAS) team.
Rules: Standard Sudoku rules (insert a number from 1 to 9 into each cell so that no number repeats in any row, column, or bold region). Numbers cannot repeat on the marked diagonals. Also, an arithmetic series must be formed along each line so that numbers in adjacent cells have the same difference. Different lines may have different common differences. (For example, sequence line could be 1-2-3-4 (difference of 1), 1-5-9 (difference of 4), or even 5-5-5 (difference of 0) if it obeys other Sudoku rules.) Different shades of gray are used to help show 3- and 4-cell lines.
GAS Time Standards (highlight to view): Two party hats (🎩🥳): 7:30; One party hat (🥳): 14:00. All other solvers earn a 🦕: Multiversal Malawisaurus.
Thomas Hits the GAS (highlight to view): 2:31, with SudokuPad replay file shared as a download for now (requires loading via settings menu with improvements expected before people should use this regularly).
Solution: PDF; solving video with explanation to be added later from GAS team.
Note: Follow this link for other less common variations of Sudoku.
Note 2: Comments on the blog are great! For a more interactive discussion, please also consider using our Daily GAS discussion post on the GMPuzzles Discord. Not a member of the Discord? Click this link for basic access.
