Yu - Gi - Oh ! Duel Monsters 5 Expert 1 Yu - Gi - Oh ! Duel Monsters 5 Expert 1 is a video game for the Game Boy Advance , and the first game to follow the real OCG / TCG rules . The game is very similar to its English version ( Yu - Gi - Oh ! The Eternal Duelist Soul ) in the story , but different in the graphics and the Booster Packs ( The Eternal Duelist Soul uses the same graphic as ) . Gameplay is similar to standard dueling rules , except that the Side Deck can have less than 15 cards , and is more for convenience of getting to cards for your Deck than switching between duels , as CPU duels are single duels rather than matches ( though you will have a match duel against a character every two weeks on a Saturday ) . Gameplay . Opponents are arranged in " tiers , " with higher tiers unlocked by beating already open tiers . A tier may consist of 4 or 5 duelists . In order to advance , all duelists on a tier must be beaten a certain amount of times before the next level can be unlocked . Beating a tier also unlocks certain in - game events , such as special cards that can only be received by beating that tier . Another important aspect of the game is the in - game calendar . On certain days of the week ( not actual days , as the game does not support a real date function ) in game , random events may occur , such as recieving a pack of cards in the mail or being challenged to a Match by an opponent . This is the first game to include Polymerization as an actual card . It also includes the Egyptian God Cards , though they are completely unusable , as the game considers them illegal . Events . When you are playing in the Campaign section , you will encounter some events . Most events are listed on your calendar , but there are a few random events that take place as well . Cards . As the game progresses , more and more cards unlocked that can be used for your Deck . There are over 900 unlockable cards ; beating a certain level or even particular duelists will unlock new Booster Packs or reward the player with rare cards . Like many previous and later Yu - Gi - Oh ! games , it also used the 8 - digit passwords printed on most cards to unlock new cards . Cards are kept in a chest where they can be accessed at any time , and may be placed in the Deck or Side Deck . Fusion cards that are added to the Deck do not go toward the 40 card minimum , and are used in the Fusion Deck . The game follows the banned list created at the time of the game . Boosters . Unlike games that follow this one , this game doesn ' t follow a general theme when dispensing cards through boosters . Instead , it follow the real OCG Booster Packs . Booster Packs List . Vol . 1 Vol . 2 Vol . 3 Vol . 4 Vol . 5 Vol . 6 Vol . 7 Magic Ruler Pharaoh ' s Servant Curse of Anubis Legend of Blue - Eyes White Dragon Phantom God Dark Ceremony Premium Pack 3 Expert Pack 1 Expert Pack 2 Expert Pack 3 Expert Pack 4 Expert Pack 5 Duelist Pack Duel Finalist Rare Selection Millennium Puzzle Gold Magazines . Weekly Jump Magazine V - Jump Magazine Card List Forbidden / Limited Lists . Forbidden Cards . There no Forbidden Cards in this game . Game options . The game contains many options , listed below . Cheats . Getting The Egyptian God Cards . The Egyptian God Cards are not legal in this game ; they also don ' t have a password , so the only way to get them is from their packs . Obelisk The Tormentor : You can obtain Obelisk The Tormentor from Duel Finalist Booster Pack . The Winged Dragon of Ra : You can obtain The Winged Dragon of Ra from V - Jump Magazine . Slifer The Sky Dragon : You can obtain Slifer The Sky Dragon from Millennium Puzzle Gold Booster Pack . Password System . Passwords can be found on the lower left hand corner of actual physical Yu - Gi - Oh ! cards . In this and many other games , a password screen allows these codes to be entered to unlock new cards . However , there are two conditions to this : D - Tactics . D - Tactics is a special function only found in Duel Monsters 5 Expert 1 . This function helps you learn the basics of the game . Doing these will help you learn how duels go , how to fuse , and so on . You should do this before playing Campaign mode . Rules in D - Tactics . There are some rules in D - Tactics . 1 ) The level will pick a Deck you use . You will use the same Deck each time you play that level . 2 ) You will start out with basically the same hand . ( Some unimportant cards will be different ) 3 ) You MUST win in one turn . 4 ) When you select a level , it will tell you a hint , so read it carefully . 5 ) Don ' t give up . Some levels are hard , but not impossible . Progressing in D - Tactics . In the beginning , you can only access 6 levels . Once you beat those 6 , the next 6 levels will be available . Once you beat those 6 , 6 more levels will be available . This will go on until you have all the levels . Multi - player . DM5 supports 2 - player Versus play , provided each player has his / her own Game Boy Advance and their own copy of Duel Monsters 5 Expert 1 . Also , one Game Link Cable is required to connect the systems ( the game is not compatible with the Wireless Link accessory for the GBA ) . Players can also transfer cards between copies of the game .