Inventory Exercise using Variables

Morning

I am developing a slide as part of a presentation that asks learners to select 10 items to add to an inventory. The idea is once they select 10 items this triggers an award for getting them correct. However I am finding that said items can be selected multiple times and they are being awarded a badge and haven't acquired all 10 items. Each click being counted as 1. Is there a way I can have the item be selected once to stop multiple clicks adding to the total?

I am using a number variable that adds a value of 1 each time an item is selected. The total is 10 and this then shows the award layer.

Any pearls of wisdom would be great.
Thanks

Frazer

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