new feature to the DS version is a collectible card system. The player is able to collect cards that feature power-ups that may be activated in the ring such as calling in a wrestler to interfere in the match, or that feature unlockables such as create-a-superstar parts and match types. Game modes The Road to WrestleMania features six new stories starring various WWE wrestlers. This year, the mode introduces a Diva-based story involving Mickie James, and a story specifically for one of the player's created wrestlers. This year's co-operative storyline, titled "Brand Warfare", features Triple H and John Cena. The remaining three stories involve Edge, Shawn Michaels, and Randy Orton respectively. Road to WrestleMania also includes storylines that branch out through interactive cutscenes before and during WrestleMania 25. The DS version also features a revamped story mode in which the player will participate in various storylines. Along the way, the player has to compete in matches, in addition to being able to improve a created wrestler's statistics, nursing the wounds suffered by the player's wrestler, or visiting WWE Chairman Vince McMahon's office. Roster WWE SmackDown vs. Raw 2010 features 67 in-game superstars and divas on each console, with the debuts of 13 new superstars to the series. The Nintendo DS version features 30 superstars, and the Mobile version features 11 superstars. The majority of the roster was revealed on September 16 during a live webcast hosted by GameSpot, featuring The Miz, Eve Torres and Howard Finkel as guests. The roster in the 2010 edition is split into six classifications: Raw, SmackDown, ECW, WCW, legends, and free agents. Like the previous game, players can choose to change the character's classification in a roster editor called Superstar Management. An extra character, Stone Cold Steve Austin, was also featured as downloadable content on the PlayStation 3 and Xbox 360 versions. The character could be downloaded by a code obtained when purchased at GameStop, EB Games or Game. Development The first announcement for the game was made in May 2009, when during an earnings call with investors, THQ declared their intent to release the next installment in the series later in the year. The game's development was officially announced at E3 2009 by WWE, Yuke's, and THQ. For the first time in the series, WWE SmackDown vs. Raw 2010 implements the Havok game engine. The software was used in the game to improve collision