Yu-Gi-Oh! Wiki
Yu-Gi-Oh! Wiki

The mechanics of this game differ from the Yu-Gi-Oh! Trading Card Game, because this game was produced at the same time as the card game was being adapted from the manga, so the rules used are some one of the original rules considered for the TCG. These differences are also contiguous with the PS2 game Yu-Gi-Oh! The Duelists of the Roses, but are not the same. The main differences are:

An example of a player going to fuse two monsters. Note that the two cards are "raised".

  • At the start of each player's turn, he/she draws from his or her Deck until his/her hand consists of five cards; if he/she cannot, the player loses the duel.
  • The player must play at least one card after drawing. This must be either a single card or a fusion/Equipment. After playing this card(s), the player cannot play any more cards from their hand for that turn.
  • Cards can be "fused" in the hand without the card "Polymerization"; the player can fuse any amount of his/her cards together and in any order, but the chance of a "successful" fusion (where a new Monster, Spell or Trap Card is made, or when a monster is strengthened) depends on the cards that the player is fusing and the order of the cards used. Only two cards can be fused at once, so monsters that require three monsters to create (such as Blue-Eyes Ultimate Dragon or Gate Guardian) require a Ritual to be used instead.
  • When any Spell or Trap Card is equipped to a monster that is not compatible, the Spell or Trap Card is discarded and the monster is unaffected.
  • After a fusion, cards can only be played face-up, but you can still select Attack or Defense Position.
  • Monster Cards must select one of two "Guardian Stars", which allow a monster to gain five hundred ATK and DEF points if it has chosen a superior alignment against its opposing card; these alignments are taken directly from cosmic bodies and are arranged as follows (> means "is superior to"):
    • Mercury > Sun > Moon > Venus > Mercury
    • Mars > Jupiter > Saturn > Uranus > Pluto > Neptune > Mars

The following example is used in the manual: "when "Gaia the Dragon Champion" (AP:2600) chooses Mercury and attacks "Blue-Eyes White Dragon" (AP:3000 and in attack position, with Sun as the alignment), "Gaia" has his AP increased to 3100, making it possible to defeat "Blue-Eyes White Dragon".

  • The Guardian Stars selected represent the Attribute and the Type of the monster. In the 3-D battle sequence the attack the monster uses depends on the guardian star selected. For example when you summon Meteor B. Dragon you are given the choice of Sun or Mars. Choosing Mars will cause Meteor B. Dragon to use a Fire Attack and give it an attack bonus against Jupiter (typically plant-type) monsters. If the player chooses Sun instead, "Meteor B. Dragon" will use a Light Attack with an attack bonus against the Moon.
  • During the Battle Phase, after attacking and before damage is calculated, pressing square will take the player to a polygonic action battle screen.
  • Cards that cannot be used at that time are darkened (once a monster has attacked, its card darkens.)
  • Pressing start will end the player's turn.