How does the swimming pool freeze?

If you update to the latest version: 3.6.0, there will be aliens coming to the earth, but in the previous version, there should be UFOs flying around. Osiris, an alien, will give you a task. The weather controller is unlocked for the first time. Put it in a family's home and set it as a "snowy day". The premise is that there must be a swimming pool at home to freeze. If you skate, just click on the freezing pool.

Although the four seasons cannot be changed, it can be changed to night or day, or storm (thunder and rain) or snowy day, which should be equivalent to changing the four seasons. . .

You have to go to the ski resort to have a snowball fight, and the ski resort can only be unlocked after completing the task. On the right side of the fountain in the ski resort, there will be two rows of things made of snow, and several snowballs will be placed on the ground in front of the house. You can have a snowball fight with a little light.