How can I create a specific order of overlapping things to unlock sth.?

Hi, I just started with Unreal and I’m pretty unexperienced, but I have to edit an escape room and I wanted to do one room were they have to step on four different planes on the floor in a specific order to unlock the room, I tried to do an event graph but I got completely lost, maybe somebody can help me.

Give the floor tiles an actor tag, which is just an int. 0 - 3.

When the player steps on a tile, append the tags into a string ( only keep most recent 4 ).

When the string is 0123, let them out :slight_smile:

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Is that possible to give a blueprint version explanation since I have quite a similar question and am still confused about how to make it …(

This is the same concept