Building upon the success of 2004's WWE SmackDown! Vs. RAW, which shipped more than two million units worldwide, WWE SmackDown! Vs. RAW 2006 adds all new features, while refining what made the original a hit with both wrestling fans and casual gamers alike. The newly created "Momentum System" will recreate the real life emotional peaks and valleys of an actual wrestling match, while the addition of a "Stamina System" will force players to play more strategically by conserving their energy in order to maintain stamina throughout the duration of a match. WWE SmackDown! Vs. RAW 2006 will also feature an extensive online component, creating a virtual WWE community where fans can face-off in intense wrestling competition.