The levels are quite interesting and it won't be easy

A golden classic.

I've fixed so many pipes in my life. From my school days on an old push-button telephone to real life.

This game has a lot of levels and nice graphics, and the levels themselves are simple (but you'll have to pay attention at a few moments). Perfect choice for a chilled-out evening.

A puzzle with a task: connect the pipes so as to create a continuous flow.
The simple mechanics of the game are intuitive.
I don't know if it's good to see where the water is flowing, but it's not very well implemented.
One of the drawbacks is the timer, which gets in the way a bit. You need to set the timer so that you can take your time.