Masyu - online puzzle game

overview

Masyu is a path-logic puzzle played on a grid. Draw line segments between adjacent points to create one closed loop that satisfies all black and white circles.

rules

• The final drawing must be one single closed loop, with no crossings and no branches.
• Every shown circle must lie on the loop.
• At a white circle, the loop must pass straight through.
• At least one of the cells immediately before or after a white circle must be a turn.
• At a black circle, the loop must turn.
• The cells immediately before and after a black circle must both be straight.

controls

• Left click edge: cycle empty -> line -> X.
• Right click edge: reverse cycle.
• Press Check to validate current progress and show a result modal.
• Press Hint for one safe correction, or New Game for a fresh puzzle in current mode.

scoring

Cleaner runs use fewer moves and fewer hints. Time is tracked from puzzle generation until solved. Check helps catch contradictions before they spread.

tips

• Start by locking obvious white-circle straights and black-circle turns.
• Use X marks to block impossible edges and avoid accidental branches.
• Use white circles to lock straight lanes, then force nearby turns.
• For black circles, first lock the corner, then extend straight on both sides.
• If unsure, run Check first, then spend Hint.

faq