They kind of represent the power of the monster. More stars = better.
Primarily though, they determine how many sacrificies or tributes are required for summoning the card. 1-4 stars is no tributes, 5-6 is 1 tribute, 7-8 is 2 tributes, 9-10 is 3 tributes, and 11-12 is 4 tributes. I haven't seen a monster with more than 12 stars and it takes the width of the whole card anyways but if there was a monster that high then I guess 13-14 stars would be 5 tributes and that's the highest it'd go since you can only have 5 monsters out at a time. But then again fusion monster don't require tributes so there could be a 15 star or higher monster but I highly doubt it.
Also, they can be used as labels for determine certain spell, trap, or monster effects i.e. all monsters 4 stars or higher must be switched to face down defense position and remain like that until this card is destroyed (level limit area B).
Cost Down
Best place to watch any episodes of Yugioh, Yugioh GX, Yugioh 5D's, and Yugioh Zexal is at the website 4kidstv.com
Series after: yugioh 5'ds is yugioh Zexal.
I don't think so, but there is a recently released game based on the new Yugioh 5Ds game called "Yugioh 5Ds Wheelie Breakers". I don't know anything about it, as I do not own it, but it is thus far the only Yugioh game for the Wii.
it is yugioh zexal its still in japan not many people know about it. kabia has 3000 atk monster but the rival in yugioh zexal like kaibia is reverse dragon 2000 atk but it gains 500 atk for each card you send to the grave yard. just to tell you it is way different from 5d gx and orgenal.The series also have a type of card called Xyz monsters.their stars are oon the left instead ot the right.They stand for ranks of these new monsters the answer above isn't wrong but yugioh zexal is in the usa now
i think .
Go to Yugioh-cards.com to check for updates when new tuornament on yugioh 5'ds be out.
yugioh zexal in Spring 2011
Walmart or a yugioh store.
yugioh zexal
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yugioh cards are made by paper so i will tell you how to get your yugioh cards for free all you have to do is go to i make yugioh cards and you can make your own yugioh cards so now you kown how to make your yugioh cards.