This is a very easy way to make a rain effect.
So, first, you have to create an object which will be what rains.
Then, in that object, you put in this code:
The create a clone block inside the forever block will make it rain forever, but to make it rain less than that, add a repeat for however long block.
Now, add in this code:
The change x block means move forward a random amount, the change y means go down 1000, and the set invisibility block means it will be invisible; if you’re making snow and you want it to settle, remove the invisibility block.
Finally, press play and you will have a really cool rain effect!