MASYU: Loop Logic Puzzle

One line. A clear mind. MASYU is a quiet logic puzzle: link every pearl on the board into a single loop that never crosses or branches. No numbers, no math—just two simple rules and your finger. Two rules, real depth - White circle ○: the line passes straight through, and must turn in the cell just before or after it. - Black circle ●: the line turns on the circle, and goes straight through the cells on both sides. From these two rules, surprisingly deep boards emerge. Features ◆ Four difficulties (Easy / Medium / Hard / Expert) ◆ A fresh Daily Puzzle — the same board for everyone, every day ◆ Every puzzle is uniquely solvable, verified by a real solver—no guessing required ◆ Fully offline, no account, no sign-up ◆ A gentle hint for when you're truly stuck ◆ Records & streaks: solves, best times, no-hint rate, daily streak ◆ Calm, paper-and-ink design in indigo and vermilion Great for you if - You've solved enough Sudoku and want a new kind of logic puzzle - You want to reset your mind during a commute or a short break - You're tired of ads and notifications and crave quiet focus - You like building a small daily brain-training habit - You enjoy Nikoli-style pencil puzzles (loop / one-stroke) Privacy - No account required. - Your records stay on your device—nothing is sent to any server. - Works fully offline.