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FILL WATER TANK
Fill Water Tank is a physics puzzle with actual liquid in it. There's water somewhere on the screen, there's an empty tank somewhere else, and your job is to get the water into the tank and fill it all the way up. Not most of the way. All of it.
What makes it interesting is that the water behaves like water. It splashes, it spills, it slops over the edge of a pipe if you release it too fast, and whatever you lose on the way down is gone. So you end up thinking about the route, not just the destination: where will the water go when I open this, what will it hit, how much will I lose at that corner.
Levels add new pieces slowly. First it's just obstacles to clear, then there are switches and moving parts, then a few that need you to do things in a specific order. None of them are timed, so you can sit and look at a level for as long as you like before touching anything.
It's a calm game. Good for the end of the day, or for anyone who liked the old water-and-pipe puzzles on phones and wants one that runs in a browser.
