MASYU: Loop Logic Puzzle

White goes straight, black turns. Draw the one loop.

MASYU (Masyu, the classic "pearl" loop puzzle) asks you to link every white and black pearl into a single loop that never crosses or branches. Every puzzle has exactly one answer, reachable by pure logic—no guessing. Climb the ranks as you solve, and make one daily puzzle a calm habit.

◆ Three promises
• Free to start, no subscription
• No third-party ads
• Your records stay on your device

◆ How to play
• White circle ○: the loop passes straight through and turns in the cell just before or after it
• Black circle ●: the loop turns on the circle and goes straight through the next cell on both sides
• Draw one closed loop that passes through every circle

◆ Features
• Four difficulties graded by depth of reasoning: Easy 6×6, Medium 7×7, Hard 8×8, Expert 8×8
• Every puzzle has exactly one solution, verified by a solver
• Daily puzzle that changes difficulty by weekday (Mon–Tue Easy, Wed–Thu Medium, Fri–Sat Hard, Sunday Expert)—the same puzzle for everyone, with no repeats until every board has appeared
• Ranks: earn points with every solve and climb from 10 Kyu to 10 Dan
• Continue: close the app mid-puzzle and pick up exactly where you left off
• Simple controls: drag between dots to draw, retrace to erase
• Hints when you're stuck
• Stats: solves, average time, no-hint solves, daily streak
• Board themes (loop colors) and a shareable image of your solved loop
• Tables and buttons stay readable even at the largest text sizes
• Quiet paper-and-indigo design with dark mode
• For iPhone and iPad, in English and Japanese

◆ Great for you if
• You've played plenty of number puzzles and want a new kind of logic puzzle
• You enjoy pencil puzzles where you draw a single line or loop
• You want a few focused minutes on a commute or break
• You prefer puzzles solved by deduction, not trial and error
• You're looking for a small daily brain-training habit

◆ Privacy
• No account needed
• Nothing you record is sent anywhere. Puzzles play fully offline
• To show our other apps, the app reads public information from the App Store