Beatmania IIDX 13: Distorted

Beatmania IIDX 13: Distorted (stylized as beatmania IIDX13: DistorteD) is the 13th game in the beatmania IIDX series of music video games. It was released in arcades by Konami on March 15, 2006. The game features a total of 55 new songs, some of which are unlocked over Konami's e-Amusement platform. Distorted's interface is a refresh of Happy Sky's interface, but using a monotone color scheme with orange wireframe patterns in menu backgrounds.

Of note, Distorted was the first arcade version of IIDX to be officially exhibited in North America, making an appearance at E3 2006 alongside GuitarFreaks V2 in response to low sales of the US PS2 version and the debut of a sequel to a game which overshadowed its release, Guitar Hero II. An English build of the next version was ultimately beta tested but not officially released.

Gameplay
Core gameplay remained the same on Distorted, but with several minor additions, such as the ability to change the High Speed setting used in-song by holding down the start button. Double and 2-player notecharts can now be flipped (so that the 1P side would be on the 2P side instead and vice-versa. In addition), High Speed 4.5 and 5.0 options have been added.

e-Amusement
Distorted switched the e-Amusement system to the new standardized e-Amusement Pass system. e-Amusement was also required to save progress in the new extra stage system, the Cardinal Gate.

Cardinal Gate
Unlike previous versions of IIDX, Distorted features 4 different extra stages in a setup known as the Cardinal Gate. The system is based on the Four Symbols in Chinese mythology. The 4 main songs are identified by their artists in the menu, and are done under aliases of the main IIDX artists. The 4 songs are Contract by 朱雀 (Suzaku), Ganymede by 玄武 (Genbu), waxing and wanding by 青龍 (Seiryuu), and 華蝶風雪 (Kachoufuusetsu) by 白虎 (Byakko). The One More Extra Stage for Distorted is 嘆きの樹 (Nageki no Ki) by 金獅子 (Kinjishi). The OMES is accessed by A'ing all the other songs on Another with Hard Mode enabled.

To access it, one must get a B or higher on the first stage, and get another B or higher on the second stage (with the second song being of equal of higher difficulty than the first). On the last stage, the player must either full combo a 5 or 6 leveled song, finish a level 7 song with a full Groove Gauge, or pass any song with an 8 or higher.

The system is not used on machines in "beat#2" mode (which unlocks all songs). All of the Cardinal Gate song feature different frames for the gameplay interface. When a Cardinal Gate song was beaten, its corresponding frame would be unlocked to use in regular play using Konami's IIDX mobile site.

Music
Notable songs from this version include:
 * Zenius -I- vanisher - a Cyber Opus song by Tatsh. The song's name is shared by a recently established Bemani fansite, and the end of the video hints about a possible sequel to the song on a later mix.
 * iFUTURELIST - a song by Akira Yamaoka, the lead single and title track of his newest album.
 * Go Beyond!! - one of the several exclusive songs found on the Console version of DistorteD, by Ryu☆ and Sōta Fujimori. The song is a Level 12 song on Another, which is known to have a complicated middle section.
 * 嘆きの樹 (Nageki no ki) - The OMES of DistorteD, this song is the 2nd in IIDX history to have exactly 2000 notes, with the 1st being 冥 (Mei) in Happy Sky.

Home version
The PlayStation 2 version of Distorted was released in Japan on August 30, 2007. It contains all the new songs from Distorted (except one, SAMBA DE JANEIRO ), 12 new songs, a selection of revived tracks, a preview song from Gold, and in honor of the 10th anniversary of Beatmania, 6 songs from the original 5-key beatmania series. The training mode on Distorted CS also features the Regul-Speed modifier option.