Everything is natural to kids. They are learning machines.
That's for sure. OP shouldn't worry too much, the kid(s) will definitely pick it up, and quickly!
Some of my earliest memories are of playing Time Pilot and Joust in a Safeway (grocery) in my home town, back when they were new... so, 82'-'83? I was 5 then.
Of course, back then my mom would only give me 2 or 3 quarters to use while she checked out the groceries, so the impetus to make the games last was there from an early age... now its just 5 5 5 5 5 keep on playin'!
