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The game has been released on the Game Boy Advance. In the game, the player can assemble three Decks and can play Duel Monsters against a variety of computer opponents. The game features the first 1,138 cards released in Japan.
==Game Speed==
The speed of Gameplay is relatively slow but can be sped up by holding '''L''' while dueling or just hold '''L''' while choosing an opponent.
==Opponents==
{{Main|''Yu-Gi-Oh! World Championship Tournament 2004'' Opponents}}
There are 29 28 opponents in the game. Each opponent has different skills and Decks revolve revolving around a certain theme ([[Yugi Muto]] = Basic, Rare Hunter = Exodia, [[Yami Yugi]] = Ultimate, etc.). There is no conversation, you just start duels right away. You might miss the key monsters/strategies from the anime in their Decks like the egyptian god cards. Sadly the weaker opponents Decks are full of junk monsters that aren't worth battling like [[Winged Cleaver]].The stronger opposing Decks (Level Four and above) put up a higher callenge since they ignore card limitations. Since many opponents don't use cards against opponents spells/traps the use of stalling cards like [[Gravity Bind]] can make winning a pretty easy task. ==Trunk==The number of total cards shown in the top bar is sadly not the number of different cards collected so far. It really means the total number of all cards you have.The other numbers in the sub categories only refer to the number of cards in your actually used deck. You can sort cards (only ascending) by chosing sorting criterias one after another. The previous sortings are kept as far as possible. (i.e. sort by 1) name 2) DEF 3) ATK) Sadly there is no useful sorting criteria for spells and traps beside "name". For faster scrolling through the card list push the left/right-button.You wil jump to the next 5 cards. For even faster scrolling hold the B-button and press up/down.
You start the game with 120 random cards. The stronger opposing Decks (Level Four and above) use three copies of the [[Limited]] and [[Semi-Limited]] default Deck can be optimzed right away with other cardsin your trunk in most cases.
==Related==
* Cards with "[[Dark Magician]]", and other magician cards such as "[[Magician of Black Chaos]]", in their text mistakenly replaces "Magician" with "Spellian". This can be seen on "[[Dark Magician Girl]]". This is likely as a result of a last-minute changing of "Magic" to "[[Spell Cards|Spell]]" using a mass-text replacer on the ROM before release.
===Card Effect===
* You are not asked if you want to activate a trap on an empty game state. So it is not possible to use [[Call of the Haunted]] during your opponents end phase i.e.
* You cannot confirm your opponents deck by yourself when using cards like [[Nobleman of Extermination]].
* [[Axe of Despair]] is not placed on top of your deck even if you have offered a monster for its effect.
* You take all the damage from "[[Burning Land]]".
* Terrain bonuses sometimes do not benefit the player, but it does benefits AI.
* Despite the text of "[[Spellbinding Circle]]" saying otherwise, if the targeted monster is Tributed, "Spellbinding Circle" is destroyed.
* If "[[Spirit Reaper]]" is targeted by an Equip Spell, only the Spell is destroyed.
* The opponent can switch [[Man-Eater Bug]] into [[Defense Position]] the turn it is [[Flip Summon]]ed if no other cards in play prevent it.
* opponents never use their [[Snatch Steal]].
* When you activate [[Call of the Haunted]] during your own battle phase while your opponent has no monsters the summoned monster attacks automatically.
* After [[Book of Moon]] was chained to set the target of an opponents [[Ring of Destruction]] the ring is sent to the graveyard even when [[Banisher of Light]] is faceup on your side of the field.
* The effect of [[Nimble Momonga]] activates even when it was destroyed by the effect of [[Sasuke Samurai]].
* The opponent can pay LP for [[Chain Energy]] even if it reduces them to zero.
* In the following situation you receive Damage equal to the (600) DEF points of an opponents [[Man-Eater Bug]]: You Attack i.e. with [[Gemini Elf]], the AI activates [[Mirror Force]], you chain [[Ring of Destruction]], opponent chains [[Seven Tools of the Bandit]].
==Smartness of AI==
* The AI...
** shows signs of "knowing" face-down cards. i.e. he never attacks a set monster if it has higher DEF than his monsters ATK.** only chains to your cards, using "[[Jar of Greed]]", "[[Magic Jammer]]", "[[Seven Tools of never attacks a monster with highest ATK on the Bandit]]", "[[Royal Decree]]", field even if he has an equally strong monster and the specific Spell-countering cards would be able to attack with other monsters afterwards.** only attacks an opponents monster with equal or higer ATK in DEF mode (like "i.e. [[Anti Raigeki|Anti-Raigeki]]" or "[[Call of the DarkSpear Dragon]]") when he has a monster with piercing effect.
** activates traps even when [[Royal Decree]] is in play. They are negated though.
** doesn't use his [[Mirror Force]] as long as he has [[Fairy Box]] in play.
** only returns 1 of the opponents monsters to his hand using [[Penguin Soldier]]
** sometimes uses his [[Mystical Space Typhoon]] on itself.
** allways tribute summons, even if the tributed monster was stronger than the new monster.
** activates [[Monster Reborn]] in Main Phase 2 even if he would have won the duel when using it before his battle phase.
** does not hesitate tot finish himself i.e. by destroying a faceup opponents [[Black Pendant]] while having less than 500 LP.
* If a card effect would make one of the AI's monsters stronger than your highest-ATK monster, but the monster is naturally weaker than the latter, the AI will still play it in Defense Position. However, it will switch the monster to Attack Position at the next opportunity.
==Trivia==
