What is the difference between Yu-Gi-Oh wc 2007 and Yu-Gi-Oh wc 2008

WC 2008 has two different places to duel. There's "Duel World" which functions similar to the "Spirit Caller" game and "World Championship" that looks and functions about the same as 2007. 2008 also has a downloadable card each day online as well as Ghost duelists, Puzzles and Banned/ Restricted Lists to download too. As with each DS installment of YGO, more cards have been included in the game bringing the total to about 2000.