In December 2007, Konami started card "downloads" for Yu-Gi-Oh! World Championship 2008 on the Nintendo DS. In reality, these downloads are merely "scripts" that add one of the particular card to the Trunk on the current game on the cartridge. If you miss out on a download on a particular day, there is no way to acquire it again using Card Download unless the same card is made available to download again at a later date (this is very rare).Cards are available for download on the same dates but on the next years. Certain cards, which cannot be obtained in-game except by downloading them are:

• Thunder King, which was available for download during both February 29th, 2008 and July 6th, 2008
• Slifer the Sky Dragon, which was available for download during July 13th, 2008
• Obelisk the Tormentor, which was available for download during July 20th, 2008
• The Winged Dragon of Ra, which was available for download during July 27th, 2008