Working along the Nabner Lines 

Thank you for this nice feature, Logic Lemur Gaming! As you argued with Row 7, it is often useful to view X-sums also from the other end in order to see what sum is left out. You explained the deductions very clearly. Thank you for the nice solve! I wish you the best for the future and I am looking forward to watching more of your upcoming content. Kind regards, Nils/sujoyku

14:03. What a lovely puzzle! 😍

Finished in 19:48. Needed a killer sudoku calculator for the X-sums.

19:09 for me, pretty nice puzzle

62:10