Flowpipe

The grid holds pairs of matching numbered dots. Draw a path connecting each pair. The catch: paths can't cross one another, and to win you must connect every pair AND fill every cell on the board.

• Connect both dots of each numbered pair with a single path
• Paths move only between side-by-side cells and may never overlap
• The board is solved when all pairs are linked and no cell is left empty

• Desktop: click and drag from a numbered dot through adjacent cells to draw its path; drag over another path to redraw it. Clear and New Puzzle buttons.
• Phone & tablet: press and drag from a dot through the cells to lay the pipe; drag back to shorten it.

• Three board sizes: 5×5, 7×7 and 9×9
• Daily puzzle shared by everyone, plus endless Practice puzzles

• Start with dots near the edges and corners, they have the fewest possible routes
• Remember the whole board must be filled, so a short direct line is rarely the answer; longer winding paths soak up empty cells
• If a region gets boxed in, redraw a neighboring path to free up space

Connecting pairs of matching numbered dots with non-crossing paths is Numberlink, the Nikoli puzzle type that the mobile flow-connect games later made familiar to everybody.

The original requirement here is total coverage: it is not enough to link every pair, the paths must also fill every cell on the board.

That single addition removes most of the slack. In plain Numberlink a solution may leave cells empty, so many boards have several answers; demanding full coverage forces a unique one, and turns a connection puzzle into a packing puzzle wearing the same clothes.

Flowpipe is an original, free browser puzzle in the number-link / flow-connect genre, where the challenge is both connection and full coverage. Every board has a clean solution and ships in three sizes with daily and practice play.

A free, original browser game on PlayPendium. No download, no install.