Destructoid: ...Konami had Decade Duels taken down. Then, towards the end of the 2012, a game called Yu-Gi-Oh! 5D's Decade Duels Plus showed up on the Live Marketplace before disappearing a couple of hours later.
Now, it has appeared once more, and this time it's staying. But what is Decade Duel Plus, anyway? Well, think of it as a big title update for the original game -- if you have Decade Duels, you will be prompted to download a 200 MB update which addresses many issues, adds more cards, and introduces an improved Multiplay experience.