Pully

Pully is a Numberlink-style logic puzzle game. Draw a single line through every square of the grid, visiting each one exactly once, while passing through numbered checkpoints in order.

Drag from square to square to extend the line, and press an earlier square on the line to jump back to it. Higher levels bring bigger grids, fewer checkpoints, walls that block the line from crossing between two squares, and tunnels that let it jump to a matching square elsewhere on the grid.