Quick tips

• Corners first. A corner square has only two neighbours, so the route must enter and leave it on those two sides, unless it starts or ends there.
• Don't wall yourself in. Before you commit to a turn, check you're not cutting off a pocket of squares you can't come back to.
• Count the gap. The squares between two numbers on your route have to fill the space you leave between them. A long detour can belong between two close numbers.
• Look ahead to the finish. The last number is the end of the line. Leave yourself a way to reach it after everything else is covered.
• Undo is free. Only time costs points, so step back with Undo, or tap an earlier square to cut your route back to it, as often as you like.