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=== Battle City rules ===
{{Main|Battle City Rules}}
To acquire the remaining God Cards, [[Seto Kaiba|Kaiba]] created the [[ante]] rule in the tournament, a rule that the winner of a [[Duel]] could take the rarest card from the loser's [[Main Deck|Deck]] (any card of the winner's choice in the Japanese version), although they were not required to (as in Yugi's Duel with Bakura). Tournament participants each received one [[Locator Card]]; in addition to the ante rule, the winner of a Duel was entitled to take one Locator Card from their opponent, with the Duelist being eliminated if they had no Locator Cards left. However, in some Duels, Duelists wagered multiple ante cards or Locator Cards. It was not clarified what would happen in the case of a draw. The first 8 Duelists to obtain 6 Locator Cards moved on to the [[Batle Battle City Finals]].
[[Duel Disk]]s had cheating-prevention mechanisms, although this didn't prevent [[Espa Roba]] from having his siblings read Joey Wheeler's cards, Weevil from slipping a copy of "[[Parasite Paracide (anime)|Parasite Paracide]]" into Joey's Deck, a [[Seeker|Rare Hunter]] from using counterfeit cards (marked cards in the dub), and [[Arkana]] from trimming his cards down to size to draw those cards more often. The [[Duel Disk]]s also allowed Kaiba to monitor every Duel by communicating with a satellite, in order to track the progress of all the Duelists.
In a move ostensibly to promote the real-life ''[[Yu-Gi-Oh! Trading Card Game]]'', the tournament used rules much closer to the Trading Card Game's rules (unlike the [[Duelist Kingdom tournament]]tournament). The most significant difference from the real-life Trading Card Game is that Duelists start a Duel with 4000 [[Life Points]] rather than 8000 [[Life Points]] (2000 Life Points in the [[Duelist Kingdom]] tournament), for the purposes of brevity. There are also other minor differences, such as being able to [[Summon]] [[Monster Card|monster]]s in [[face-up]] [[Defense Position]] (rather than [[Set]]ting them) and [[Fusion Monster]]s not being able to attack during the [[turn]] they are [[Summon]]ed. From this point onward, almost all Duels in the series follow these rules, except for the restriction on Fusion Monsters attacking.
===Marik and the Rare Hunters===
