What's good about World Championship 2007? In-game A.I. is more intelligent than in previous YuGiOh video-games. Many newer cards are available in-game, like Card Trooper. Other cards, duel puzzles and ghost characters are WiFi downloadable. Leaderboard characters can be downloaded as in-game ghosts to duel. Nintendo WiFi allows one to battle with friends/strangers worldwide. Several Banlist settings are available: Sept 06, March 07 and WC07. Interact with Nightmare Troubadour to unlock hidden characters. It includes characters from "YuGiOh: GX" & the original YuGiOh anime. More duel disks and clothing options unlockable; player customization. Extensive tutorial mode helps beginning players. Defeat lower level in-game characters 5+ times = unlocked characters. Many recipies can be saved; deck-editing is easy via touch-screen. Playing via the touch-screen is LOTS of fun. 3 free promos: Exploder Dragon, Spell Striker, D-Hero Disk Commander.What's bad about World Championship 2007? Cards/sets released after the game release are not currently avilable. Some older cards that would be useful in-game are not available. In-game character texts (speech bubbles) get repetitive/annoying. One must try completing challenges to unlock more hidden packs. Nintendo WiFi battles are sometimes lopsided in their rankings. WiFi disconnections (deliberate or accidental) often = rank loss.Overall?Though annoyingly difficult once in a.