how to instantiate multiple 2d background?

Questions & Answers
1

I want to make 2d game in which game object is falling down and background need to instantiate vertically

2

Look into object pooling, to avoid lots of extra gameObjects, but pretty much the simplest way to do this is:

Instantiate(mySprite, Vector3.up * transform.position * anOffset, Quaternion.identity);

This just creates a new sprite at (0, y, 0) where y is whatever the height you need is.

anOffset value is a float.

Look here for more info: Instantiate