Knot Flow

Each board has pairs of matching colored dots. Drag a path from one dot to its partner so every colour is linked. The twist is depth: paths may cross, and when they do, the pipe you draw tucks under the one already there, letting you knot routes together on two layers.

• Trace from a dot through adjacent cells to its matching dot to complete that colour.
• Cross an existing pipe and yours automatically dives one layer under it.
• Connect every colour to solve the board; fewer moves scores higher.
• Tap any laid pipe to clear that colour and reroute it.

• Desktop: click and drag from a dot to draw its path; tap a pipe to clear it; use the Clear button to reset the board and the speaker icon to mute.
• Phone & tablet: drag your finger from a dot to its match; tap a pipe to clear it, fully touch-friendly.

• Daily: one shared puzzle each day, separately ranked.
• Levels: a hand-built pack of boards that grow in size and colour count.

• Run border colours along the edges first to free up the crowded middle.
• Plan your crossings, a deliberate dive can untangle a board that looks blocked.
• Shorter, tidier routes mean fewer moves and a better score.

Linking pairs of coloured dots with paths is Numberlink, the Nikoli puzzle type behind every flow-connect game.

The original addition is depth: paths may cross, and the pipe you draw tucks under the one already there, so routes weave on two layers.

Non-crossing is Numberlink's single hard rule and the source of all its difficulty — the board is a planarity problem. Allowing an under-crossing removes that, and replaces it with a question about order, since which pipe was drawn first decides which one goes beneath.

Knot Flow is an original free browser game that reinvents the flow-connection / pipe-linking puzzle genre with a second layer, so crossing paths weave over and under instead of blocking. Built in-house for PlayPendium with a daily board and a progressing level pack.

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