If you are stuck on chapter 3 at luring the hattifattener which is part of the Barometer quest of Moomin: Midsummer Madness, here is the quick and easy guide on what items to find and who to talk in my video below.
Click on the perched woodpecker
Next to the hattifattener’s location, there is a tree on the left. Use Little My to climb the tree and get it.
Go talk to Mimble outside
She is going to tell you about the hattifattener’s dislike for bad weather and why she is wearing a raincoat. Take the newspaper she tosses, as you need it to read to the hattifattener’s once you get the other parts of the puzzle ready.
Go to the machine with the broken lever
Select your sling shot received from chapter 2 and click it on the machine next to the door leading to the room that Snorfmaiden is in. You will get to switch, not only the sky to thunder, but also the objects on the stage. Choose the castle setting in the slot for the items and keep in mind the knight armor is what you will be using to make the thunder noise.
Go back to the front stage
Place the woodpecker on the knight armor. Select the newspaper and gave it to the Hattifattener who is still sitting at the center of the stage near the water seated with the fan.
Weather Forecast Mini Game
Control Little My movements, left and right, to catch the bad weather symbols while avoiding the good weather logos until the meter shaped like a hattifattener on the right is filled.
The Barometer
You can now dive into the water to get the barometer that is below. Use the door that is on the floor to the left of the stage to dive. Make sure while you are swimming to go turn on the fan on the right where the hattifattener was sitting to continue to complete the chapter 3.
Hope this helps!