Editing Dance Dance Revolution (section)

===Extra Stage system===
The Extra Stage, originally introduced in ''1stMIX'' and reintroduced in ''MAX'', rewards a player for clearing three songs, either with a high enough grade on the final stage or by fulfilling specific play requirements. The player receives the opportunity to play a free extra song, which often defaults to a very difficult song with forced modifiers (such as 1.5x speed and Reverse) and LIFE4 since ''DDR X2'', a life bar identical to the battery bar similar to Challenge mode with 1–4 lives depending on their score in the final stage in ''SuperNOVA 2'' and ''X'', or a non-regaining life bar before ''SuperNOVA 2''. Beginning on ''SuperNOVA 2'', players may be able to access the modifier menu (LIFE GAUGE is disabled) and the forced modifiers (save for battery bar or LIFE4) are no longer used. However, the Replicant-D Action event in ''X2'' and since ''DDR 2014'' did not allow players to select modifiers for its Encore Extra Stage.

Before ''EXTREME'', the Extra Stage song was predetermined. Afterward, any song can be played for the Extra Stage, although there is still a song designated as ''the'' Extra Stage (usually marked with red letters on the song wheel, or contained within the EXTRA EXCLUSIVE folder. In all cases (etc. in EXTRA EXCLUSIVE songs), they must be unlocked for regular play). A player who attains a grade of "AA" (or "A" in ''SuperNOVA'' or 950.000 Supernova 2 points in ''A'') on the Extra Stage is invited to play an additional stage, "One More Extra Stage" (OMES, or Encore Extra Stage post-''SuperNOVA''), with another special song option, played in RISKY, in which any combo-breaking step or missed freeze will cause an instant failure. Since ''X3 VS 2ndMIX'', some Encore Extra Stage songs are marked as "ATTACK PERFECT FULL COMBO", where any judgment less than Perfect will cause the player to fail the song. Unlike Extra Stages, the song for Encore Extra Stages remains predetermined, the only exceptions were ''SuperNOVA 2'' and ''X'', which allowed players to play any song for their Encore Extra Stage. Usually, if this final boss is beaten, a special credits sequence is played.

With the implementation of [[e-Amusement]] in DDR, mixes after ''SuperNOVA'' have contained multiple songs as extra stages, often based on specific conditions, such as playing specific difficulties or songs.

From ''MAX2'' onward, the BPM of Extra Stage songs is displayed as a random, changing number, instead of the song's true BPM to hide it from players, also when KAKUMEI was played as an Encore Extra Stage, its Groove Radar data is hidden by continually animating through random songs' ratings.  The random BPM display is replaced with the normal BPM display in the next mix, and as of ''X'', after the said song has been unlocked for normal play.