Dance Dance Revolution: X2

Dance Dance Revolution X2, abbreviated DDR X2 or simply X2, is a music video game, and a part of the Dance Dance Revolution series. The arcade version of DDR X2 was revealed by Konami on November 20, 2009. A sequel to the Dance Dance Revolution X, X2 began public beta testing on November 25, 2009. The game was released in Japan on July 7, 2010.

Development
The first public location test for Dance Dance Revolution X2 was announced by Konami on November 20, 2009, to be held from the 25th to December 3, 2009 in Akihabara, Tokyo. The location test revealed new features such as a redesigned song selection interface, new adjustable versions of the Sudden and Hidden modifiers, and the ability to adjust these settings and the speed of the arrows in-game using the control buttons on the cabinet. The location test version did not contain an Extra Stage song, but "POSSESSION" was accessible on the build if certain conditions were met.

In response to player complaints about the lower quality cabinets that were used for the American and European releases of Dance Dance Revolution X, an updated version of the cabinet will be used for X2. Improvements include the reduction of input lag, and higher quality pads more similar to their Japanese counterparts, but still featuring some of the design changes made originally to reduce the cost of the game. Upgrade kits will be available with the new pads included, but upgrades will only be available for DDR X cabinets due to various factors not allowing upgrade kits for pre-X machines to be sold in America.

Music
Over 70 new songs are included in X2. All licensed songs from Dance Dance Revolution SuperNova and Dance Dance Revolution SuperNova 2 (With the exception of "Angelus" and "Golden Sky") have been removed due to their licenses expiring. However, 4 classic licensed songs from earlier DDR mixes have returned in remastered form, along with a special remixed license track. The first location test build contained 14 new songs, plus one secret song, Possession, which had special conditions required in order to be unlocked. 3 additional songs were added on an updated build installed several days after the testing began.

In the 2010 Japanese Arcade Operators Union expo (AOU2010), Konami showed a newer build of the game. This newer version showcased even more new songs, including additional material from other BEMANI music games.

The final release of the build revealed many new unlocks, special remixes by Konami artists, and song revivals. The licenses include selections by well known Japanese and Western artists. This the very first DDR arcade release to include licenses from the Cyber Trance series of albums. It is also the first time that Super Eurobeat tracks have been featured in a DDR game since Dancing Stage featuring Disney's Rave. Other songs have been ported over from the latest PlayStation 2, Wii, and Xbox 360 DDR releases.

One of the new features included in the main game mode is a special "extra stage" system. Known as Replicant D-action, this mode allows players to choose from a set of 6 difficult songs. When a player gets rank AA or more one of these songs (any difficulty), they receive a medal for that particular track. When players subsequently earn all 6 medals, they can access the Encore Extra Stage, "Valkyrie dimension".

Below is a list of songlist changes featured in the final version thus far. Rows labeled in bold type represent songs that need to be unlocked in order to play them. Note that this is not a complete songlist and is subject to change.

(*) The DDR 2009 series consists of the shared songlist between DDR X2 (North American PS2 version), DDR Hottest Party 3 (North American Wii version), and DDR MUSIC FIT (Japanese Wii version).