Make objects spawn in a random sequence

How do I...?
1

This is my first time trying to make a game. Im trying to make a side scroller where on your journey you have to dodge things like rocks and holes and stuff. Im trying to make the rocks spawn along the path in a random order but they always spawn in order from top to bottom. Ive tried a few methods and just cant quite get it to work the way I want. There are 3 paths that they can spawn on, top, middle and bottom paths.

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Im trying to delay the next spawn of the rock so that the player has enough time to get the wagon onto a path that will avoid it. The distance between the spawner and the rock seemed to work for that. I tried to use the randominrange but it would only select each number one time, so each rock would spawn only once. I tried a few different things like trigger only once on each method (rng variable, rock path array) but I am open to any and all suggestions.

Thank you in advance!

2

Make variable called RNG
Make 4 events

1st
Condition
At beginning of scene

Action
Change variable RNG set to RandomInRange(0,2)

2nd event actually this will be same for all 3 of them
With exception of where to spawn them

Condition
However you trigger when it should be create
Value of variable RNG = 0 < this part will vary for other two so for next it will be 1 and for last 2
(Fake i just here clicked on your image and noticed you did almost exactly what i was describing)
TRIGGER ONCE

Action
Create object rock on top < this part will vary for each event put different position
Change variable RNG set to RandomInRange(0,2)

And now you repeat it for other 2 events varying it like i mentioned above