23995346
a cheat to summon it is get cyber-stein and activate its effect then choose beud
note:it will cost u 5000 points
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Not sure if you mean the Serial Number, since those are usually always the codes for every card, which Blue-Eyes Ultimate Dragon's code/serial number is 23995346, if that's what you're asking.
As with all monsters that have Ritual Spell Cards, you cannot obtain Blue-Eyes Ultimate Dragon as a card by itself via the Password section or as a Spoil. In-game, it can only be Summoned by using the Ultimate Dragon Ritual. Use this ritual when there are three "Blue-eyes White Dragon" cards on the field. You can fuse Megamorph & Dragon Treasure to get the Ultimate Dragon ritual.You can, however, obtain Blue-Eyes Ultimate Dragon via a cheating device such as Codebreaker or Gameshark. The code for Blue-Eyes Ultimate Dragon is 301D03CB 0063.For more codes on other unobtainable cards, click on the "Related Link" below. Note that Blue-Eyes Ultimate Dragon is Card # 380 in the game. This means that it corresponds with the code next to Card 380 on the website.
"SUPREME" is the code for Blue-Eyes Ultimate Dragon.
23995346 i should know i have the card. if there is any other questions about the cards use this website http://yugioh.wikia.com/wiki/Main_Page
23995346.