Masyu

Draw a single closed loop through the centres of the cells. The loop moves horizontally and vertically, never crosses or touches itself, and must pass through every pearl. Cells without pearls may be left empty.

• ⚫ Black pearl: the loop must turn on it, and travel straight through the next cell on both sides.
• ⚪ White pearl: the loop goes straight through it, and must turn in at least one of the two cells next to it.

Controls

• Drag from cell to cell to draw the loop; drag back over a line to erase it.
• Tap between two cells to cycle that segment: empty → line → ✕ (no line) → empty. Right-click or long-press there for a ✕.
• Ctrl+Z undoes. Check highlights wrong segments and Hint draws one correct segment.

Branching lines and broken pearl rules are shown in red. Every puzzle has exactly one solution.

Tips

A black pearl on the edge of the board must head away from that edge. Three white pearls in a row force parallel lines through them. A white pearl on the edge runs along the edge.