Academia Disk The Academia Disk is a Duel Disk given to students at Duel Academy ( " Duel Academia " " in the Japanese version ) , " shown in the " Yu - Gi - Oh ! GX " series . Characteristics . Aside from the obligatory alternate folding feature , and a cosmetic refit , this Disk functions identically to the KC mass production Disk . The shift from standby to active mode of this version of the Duel Disk is much less pronounced than the KC mass production variant , only requiring the top section of the card platform to extend . An updated version of the Academia Disk has the color of the user ' s dorm on it . In season four , the students use these new Duel Disks . Unlike previous models , there is no sound effect when cards are placed on the Duel Disk to signify that the Duel Disk recognizes and activates a specific card . However , In " Yu - Gi - Oh ! Bonds Beyond Time " , there was actually a sound effect when Jaden places a card on his Duel Disk . History . Duel Academy students originally used the KC mass production Disk , before this one was introduced . In the final season of " Yu - Gi - Oh ! GX " , color variations were released . Students got red , yellow or blue disks depending on the color of their dormitory . Other variations of the Academia Disk exist , such as those used by Amnael and Adrian Gecko . Duelists in " Yu - Gi - Oh ! 5D ' s " often use Duel Disks that resemble the Academia Disk , but they come in different color combinations . In the " Yu - Gi - Oh ! GX " manga , the Academia Disk is shown to have a further function . The central " gem " functions as a screen that a Duelist can use to check cards Set by partners in Tag - Team Duel s , as well as to check cards in the Graveyard of their partners and opponents . In the " Yu - Gi - Oh ! 5D ' s " manga , the Academia Disk is shown being used by individuals not related to the Academia , implying that it was a standard replacement for the Battle City model . Real world . As with the KC mass production Disk and Chaos Duel Disk , Mattel made replicas of the Academia Disk . They fixed one of the main problems of the Disks by resizing the Zone s to fit cards with protective sleeves . However , it can only hold 40 cards with sleeves . Many of the other problems remained , including : This Duel Disk is the first one that is identical to its anime counterpart . Although the main flaw with the Duel Disk was addressed in the new Academia Disk , many of the major flaws still remained unaddressable . Although the Duel Disks are perceived as " toys " , few use the Academia Disk in place of taking up space on a table . Along with the release of the Academia , Mattel produced a specialized carrying pack for the new disks , although none have been used or seen in stores . Due to past sales of the Academia Disk and the limited popularity with the toy as a dueling medium , Mattel discontinued the production of the Academia Disk several months after its release . A Slifer Red Academia Disk was released in Japan in November 23 , 2007 , retailing at ¥5985 ( ¥5700 excluding tax ) . Also included with the product were 100 card sleeves , a card case , three Booster Pack s : " Tactical Evolution " , " Gladiator ' s Assault " and " Phantom Darkness " and five promotional cards : " Elemental Hero Prisma " , " Card Ejector " , " Hidden Armory " , " Assault Armor " and " Evil Blast " . Non - canon appearances . In " Yu - Gi - Oh ! World Championship 2008 " , the player can unlock the red disk , if the player win Tag Tournament Mode one time . The player can unlock the yellow disk , by winning ten single duels . The player can unlock the blue disk , if the player participated in the Japanese WC Tournament . In " " , the player can unlock the red Academia Disk by winning the level 1 tournament , the yellow one by clearing the Tag tournament and the blue one by winning ten Wi - Fi Duels . In " " , the player can purchase this Duel Disk in red , yellow or blue from Chihiro for 5 Star Chips . In " " the player can purchase the Red Academia Disk from Kazuhiro for 5 Star Chips .