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How to play

Join each pair of equal numbers with a single line. Lines run from cell to cell — across or up and down, never diagonally — and never cross or branch. When you're done, every cell on the grid is part of a line.

Drag to draw: from a number, from the end of a line, or wherever you know a line must go — pieces join up as they meet. Drag back along a line to erase it, or long-press (or right-click) a cell to clear the lines through it. A number turns solid once its line reaches its partner.

Shortcuts

• Arrow keys move; Shift + arrow draws a link from the cell you're on, or erases it; 0 clears the cell.
• Z undoes, Y redoes, H asks for a hint.