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Please make this claimable so that it is added to collection, thanks!

I'm a little embarrassed to say that I am not sure what you mean by claimable. Can you help me out? I don't see any toggle for it.

Set a price for the game (like $1 USD or any other amount) then provide it at 100% discount.

At that point, the 'paid' game should have an option in the developer settings to make it claimable unless you explicitly disable it.