Connect the Pipes: Water Puzzle

Colour is what sets Connect the Pipes: Water Puzzle apart from a plain pipe-turning game. Each board is made up of pipe pieces, water sources and drains, and you turn the pieces until the water from a source runs all the way to a drain.

Some drains are fussy. Water leaves the sources in different colours, and a drain may only accept one particular colour. When the colour it wants does not come out of any single source, two streams have to be brought into the same pipe so they mix and make it. Without that rule, a level would be a routing job. With it, you also have to decide which sources should share a pipe. The developer describes dozens of levels and says the difficulty rises as you go, with new mechanics added along the way.

Tap any pipe on the board to rotate it. Keep turning pieces until there is a continuous run from a water source to the drain it should feed. Where a drain asks for a particular colour, guide streams from different sources into one shared pipe so they blend, then carry the mixed water on to that drain.

Read each drain's colour before turning a single piece. If a drain needs a colour that none of the sources produce, two streams must meet in a shared pipe somewhere upstream of it. Working that out first narrows down which pipes need to point where, and saves a lot of aimless rotating.

A pipe-rotation puzzle with a colour-mixing rule. It runs in a tall portrait frame (1080 by 1920). Pipes turn with a tap, and the developer mentions dozens of levels that grow harder and introduce new mechanics.

Plumber World also has you turn pipes to carry water from a reserve, in its case to fountains, houses and pools, while Neon Circuit swaps water for power and asks you to rotate tiles until every terminal is lit.