Heat it, cool it, make the weather!
Puff the little cloud runs a lab full of glass sky jars. Your child heats them, cools them, blows wind on them and adds water or ice, but first they guess what will happen. Then they watch ice melt, puddles evaporate, clouds form, and rain or snow fall, and every discovery changes the weather in a little valley outside.
Everything happens in one sealed jar, so the water never leaves. It just changes form, which is the big idea behind the water cycle:
Tap Start your first quest . A villager from the valley asks for help, like Fennel the frog, whose pond froze solid. Below the jar are the lab buttons: Heat , Cool , Big chill (two steps colder at once), Wind , Add water and Add ice . Each quest gives only the buttons it needs.
Every time your child taps a button, Puff asks a question before anything happens: "What will happen to the ice?" They pick an answer, like It melts into water or It stays ice , and then the jar shows what really happens. A right guess gets a cheer. A wrong one is called a surprise, and the explanation shows why, because surprises are how scientists learn.
Read the full Cloudwhistle Lab guide
Not quite. Water vapor is an invisible gas. The white puff you see above a kettle is made of tiny drops of water that formed when the vapor cooled in the air, like a little cloud. Right at the spout, where you can see a clear gap, that is the invisible vapor.
Clouds are made of tiny drops of liquid water or tiny bits of ice, not vapor. They form when water vapor in the air cools and condenses. That is why the game turns invisible vapor into a cloud only when the jar is cooled.
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