Can we have something that collects things as the students find them throughout the game/scavenger hunt and adds them to the student’s inventory or “found list.”

This could be a box, a bag, an image on the screen (I don't know). Then the student can travel through the playground and retrieve items from the "found list", which can be used in other parts of the game.

FOR EXAMPLE: When my student finds the key in the underwater part of my game, they can click and choose to add it to their "found list/inventory". Then they would be free to walk back up to the above water layer of the game, retrieve the key from the "found list/inventory" and use it to open the door to the secret room inside of the castle. Or perhaps they have to submit they key into the action zone in order to trigger the reaction prop and continue in (or win) the game.

I think this may help with the trouble of having to hold on to items and try carrying them really far away.

Perhaps this can be a feature that can be toggled on or off, depending on if the teacher wants to use it for that class or playground story.