Core Sudoku

Core Sudoku delivers a pure, elegant Sudoku experience built for focus and flow. Tackle handcrafted puzzles across Easy to Expert, supported by smart notes, number highlighting, and gentle error checks that keep the challenge fair. Train daily with time trials, daily challenges, and streaks, then review detailed stats to improve your solving. Enjoy clean visuals, fast controls, and offline play. Play classic 9x9 boards, learn with logic based hints, unlock achievements, and customize your board with themes and input styles.