Hello,
I am trying to make a game that has the same background all the time but the player moves up on the Y axis. And there are some images that appears randomly. (like doodle jump if you know this game)
I was trying to search in the internet but I didn`t find a simple solution, I hope you will give me a simple one that fits my conditions. Thank you guys!
More of a question for the Answers section, instead of the Forum. Probably better luck over there 
@panoramabeats How can I ask there? I am new to the forum.
I guess you should just make procedural background.
Search under keywords like procedural terrain, infinite runner etc.
I remember a nice demo asset including procedural terrain generation which you can find here: