In IIDX games, players recreate the musical score of songs available to them through the use of a DJ simulating controller. The player must coordinate their hands in order to hit the correct keyboard buttons, spin the turntable, or a combination of both in correspondence to color coded notes that approach the judgement bar displayed on screen.
Source: Wikipedia, "Beatmania IIDX", available under the CC-BY-SA License.
beatmania IIDX 5th Style features 35 new songs, five of which are hidden. New features introduced in this version are auto-scratch (allows the player to focus on the 7 keys instead of the turntable), as well as two more Hi-Speed settings (HS2 and HS3.) 5th Style's songlist featured the first songs that would later become "flashing 7s", here differentiated from regular 7s with a kanji meaning "forbidden".
Notable songs from this version include Deadline (the first song in the series to be licensed by the Japanese Avex Trax label) and V. V was a popular song by dj. TAKA which is a remix of Vivaldi's Concerto for Violin in F Minor, Op. 8, No. 4, RV297, "Winter", I. Allegro non molto. The song has been featured in eight console versions of beatmania IIDX (5th - 10th, 12th and the US version). It has also been featured as a "crossover song" in Konami's other music game series Dance Dance Revolution and Pop'n music. The song would later be recognized as the oldest song with a difficulty rating of 12, for its Another chart.
The home version of 5th style was released in Japan for the PlayStation 2 contains all the new songs from the Arcade version, revivals from older styles, and new songs. The game also features a Beginner mode, "Drill Mode" and is supported by the PS2 Hard Drive to improve loading times.
Source: Wikipedia, "Beatmania IIDX 5th Style", available under the CC-BY-SA License.