How do I implement this?

The game works like this, vertical infinite scroll where you have to dodge obstacles, every x score the season changes to the next (from spring to summer).

The game is already infinite but I don't want it to stay always summer (which is the last season) how do I repeat the first season event without having to repeat them and getting miles of events.

Yes.

Scroll.y > variable + multiplier, change to next season, set variable to scroll.y

Thanks, it worked.