How do I select multiple objects in game?

I have a game im remaking for someone and they have a system where the player gets a list and selects the objects from the list. It has ten levels with more objects on the list at each level. What I'm trying to do is find out how I can make it so when the player selects all the correct objects they go to the next scene.

This sounds really basic. What part exactly are you finding hard to do.

I don't know where to start, I thought it might be easy but just can't find anything about it.

is there a tutorial that I could look at just to get the basic understanding?

I would do it like this:

Move all the items to a family and give a variable or maybe a boolean called "selected" to the family.

Make an event that sets the boolean true if the item is selected.

Make an event that moves the player to the next level when all the desired items have their selected boolean set true.

Like this:

dropbox.com/s/kcfffbhj0cc4aqj/Selected.c3p

Check out the video's on my youtube channel.

You will find you get a lot of info on how to get started on making games and how the mechanics work.

youtube.com/channel/UCZ6QjvqEs9dR2miRnfFqIpQ

hope that helps