Not cruising for awhile but I have two children and two nephews who will most likely want to visit the arcade at some point on the cruise. How does this work? Do they use money? Or Sea Pass card? The children will not have charging privledges so how will they be able to use the Sea Pass Card? Two of the kids will be 13 and old enough to be on their own. But I still don't want chagring privledges. Just trying to understand how that system works.