beatmania IIDX
Arcade Releases
1st - substream - 2nd - 3rd - 4th - 5th - 6th - 7th 8th - 9th - 10th - 11 IIDX RED - 12 HAPPY SKY 13 DistorteD - 14 GOLD - 15 DJ TROOPERS 16 EMPRESS - 17 SIRIUS - 18 Resort Anthem 19 Lincle - 20 tricoro - 21 SPADA - 22 PENDUAL 23 copula - 24 SINOBUZ - 25 CANNON BALLERS 26 Rootage - 27 HEROIC VERSE 28 BISTROVER - 29 CastHour - 30 RESIDENT 31 EPOLIS
Foreign Arcade Releases
beatmania IIDX (China) - tricoro (China)
Home Releases
Sony PlayStation 2
3rd - 4th - 5th - 6th - 7th - 8th - 9th - 10th beatmania (2006) - 11 IIDX RED - 12 HAPPY SKY 13 DistorteD - 14 GOLD - 15 DJ TROOPERS 16 EMPRESS + PREMIUM BEST
PC Releases
INFINITAS - INFINITAS (2020)
Mobile Releases
i-αppli - IIDX i-αppli - ULTIMATE MOBILE

General Information

Release Date: May 18, 2006
89 songs, including all 52 from IIDX RED AC (includes all licensed Eurobeat songs, as well as 8th CS songs such as Nebula Grasper, Tell Me More, and More Move)
In-song score graphs (blue bar: current score, green bar: your high score, red bar: rival's high score)
Able to select from up to five other peoples' score data to be your "rivals" by importing their scores from their memory cards
Able to sort in various ways on the song select screen according to your rival data (showing songs on which you're beating your rival, for example)
"Ghost score" feature from Happy Sky AC that allows you to see how you're doing as compared to another score (your best or your rivals' best) as you play through a song, showing the EX score difference continually (based on the score they had in the song at that point)
HS 4.5 and 5.0
The ability to change hi-speed settings during a song
HIDDEN+/SUDDEN+ functionality (hold START and move the turntable to adjust during a song)
Custom UI skins/note splashes/turntable designs
Individual notecounts for songs (Just Great, Great, etc.) are saved once again.

New Songs

S-RAN+ makes a return in CS RED (reduces the number of fast jackhammers when playing S-RAN). To use it, set the S-RAN option in Free Mode. Then move to a song beginning with "S", and hit Select. Then move to a song beginning with "R", and hit Select. Do the same for "A" and "N", in order. You should hear a sound effect play, letting you know that S-RAN+ has been enabled.
To view individual note counts for high scores, press and hold Select while the options menu is up in Free Mode.

GAMBOL and ErAseRmoToR maXimUM both have new anothers that must be unlocked.
To unlock GAMBOL [A], clear the SLAKE Expert course.
To unlock ErAseRmoToR maXimUM [A], go to Arcade Mode, switch to Another difficulty, and pick Random from the All Music folder for all three songs. ErAseRmoToR maXimUM [A] will be your fourth and final stage. Clear it to unlock it.
Both of these songs can be played in Training Mode before being actually unlocked.