When I tried this TradingCardGame I was skeptical. I just wanted to try TCG with DS. I was bit worried, but I was wrong.
There are two main modes in the game, Duel World and The World Championship. Tutorial was hard to find, because it was strangely in WC-mode. Tutorial was good to learn the basic rules fast (and to get some points). Game seemed to be hard at the first time, but it wasn't. It's actually quite simple "Battle game" with cards. Game is easy to learn but still it's really deep TCG with a lot of different kind of techniques and customization.
Main mode is the Duel World, where you battle different kind of A.I monsters. With victories you gain points, which are good for buying new "booster" cards. This "adventure mode" is shallow; it feels little bit empty because there is no story. Still it's strange that the adventure doesn't feel much, but still the game is really addicting. Collecting cards is fun.
If you have Wi-Fi connection World Championship mode is for that. Endless battles wait there with other people of the world. I haven't tried that yet =)
If you want a solid TCG for DS, this is your game. I have been playing this over 20 hours and there's no stopping. You get a lot of value for your money. Recommended!