Daily Brains: one beautiful newspaper-style Sudoku a day, the same grid for everyone. Every puzzle has exactly one solution and is graded by the human techniques it needs, from a gentle singles-only Monday through pairs, pointing, triples, X-wings and XY-wings to a fiendish swordfish-or-XYZ-wing Sunday. Tap a square then a number (built for one thumb), pencil in notes, undo, take a gentle hint, and chase a clean solve under par. Streaks, statistics and a spoiler-free share line.
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