The manga would sometimes reference simplistic games like table hockey or even toys that react to sound, some were more complex including the aforementioned card game against Kaiba or a chess like game using small monsters and while theres clearly some logic as to how the game plays out so readers can follow along, there is no design document explaining all the rules of these games simply because thats not what the manga is trying to do
For instance, there are several Pokmon that will commit wicked deeds just for the fun of it, and some who will even kill people and other Pokmon
Not to mention, as someone who's been collecting the Final Fantasy cards, they can be hard to find in stock these days
With so much money flowing into Pokemon cards, it can be easy to lose track of why we do this
As you personalize it, every card becomes a bit more special
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