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Number Nook

Number Nook is a polished, free online Sudoku you can play instantly in your browser with no download and no sign-up. Every board is freshly built by a real backtracking generator and then carved down with a uniqueness check, so each puzzle has exactly one solution and never relies on guessing. Choose Easy, Medium or Hard to match your mood, switch on pencil-note mode to jot candidates into the corners of a cell, and lean on live mistake highlighting when an entry clashes with the solved grid. A built-in timer tracks each attempt and your best time is saved per difficulty, so there is always a personal record to chase. With a clean, legible grid, clear separation between the fixed givens and your own entries, and a satisfying finish when the last number clicks into place, it is the perfect calm brain-teaser for a coffee break on phone or desktop.