Disjoint Groups Sudoku (Fun With Sudoku #153)

This Disjoint Groups Sudoku holds a special place in my puzzle-creating journey, as it was part of the Sudoku Mahabharat 2016 Twisted Classic test at Logic Masters India. Before this, I struggled with this variant—my earlier attempts often ended up feeling like classic Sudoku. However, preparing for the Mahabharat required intensive practice, which not only improved my solving skills but also helped me create this puzzle where the disjoint groups rule is used extensively.

The puzzle requires you to apply classic Sudoku rules along with the key disjoint groups constraint: cells in the same position across all 3x3 boxes must contain unique digits. This creates a powerful global logic that shapes the entire solve. It's a print-friendly puzzle, ideal for those looking to master this variant or for anyone seeking a challenging and rewarding session.