Medium Hyper Sudoku

Medium Hyper Sudoku — around 31 givens. Hyper regions overlap parts of four standard boxes each, which means a digit forced into one half of a hyper region also propagates into two boxes you weren't looking at.

Medium puzzles start to need basic pencil-mark techniques: naked pairs (two cells in a unit that can only be two specific digits) and hidden singles across wider units. A typical solve runs 7–15 minutes.

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