Duets

Duets are feature that debuted in Just Dance 2, and has reappeared in all of the following games ever since.

Just Dance 2
In Just Dance 2, Duets were brand new to the series. Here, pictograms come from different sides (from the left for P1 and from the right for P2) and are colored like Solo pictograms; as a consequence, Gold Move ones are all gold. However, P2's pictograms appear only if there are two or more people playing, and it's not possible to choose the coach. Instead, the coaches are chosen by which Wii Remote the player is holding (P1 and P3 get the left dancer, and P2 and P4 get the right dancer). There is an option in the menu that hides all Solo routines, so it is easier to see all the Duets. There is also a feature called Duet Medley.

There are a total of 21 Duets:

Just Dance Wii
Duets reappear in this game; the features in Duets are the same from Just Dance 2.

A total of 8 duets are in the game:

Just Dance 3
In Just Dance 3, Duets returned. You can now choose which coach you want to play as. Pictograms for both players are now combined, and they come in from the right side, like in Solo dances; therfore, the arrow color is the same as the pictogram color, and the Gold Move ones keep their original colour but are surrounded by a golden glow. Along with the new feature, Dance Mashups, Duet Mashups were also added. Duet Medley returned, too.

There are 15 Duets (4 of which are unlockable), 2 Duet Mashups and downloadable Duets (many of which are recycled from Just Dance 2):

​ABBA: You Can Dance
Duets return in ABBA: You Can Dance, which is, therefore, the first spin-off with this feature. The pictograms are individual and they are all black with light blue arrows, a magenta spot on the right arm and a white semi-transparent circle; Gold Move ones have a golden glow behind ther back. Unlike many games, they slide from the bottom to the top on a curved slide next to the score bar.

There are a total of 7 Duets in this game:

Just Dance Wii 2
Duets reappear once again in Just Dance Wii 2. The features are the same from Just Dance 3. This is the second game in the Japanese series to feature Duets. Duet Mashups are not available.

A total of 8 duets are in the game:

Just Dance 4
Just Dance 4 brought Duets back. There was no difference from Duets in the previous game, excluding the absence of Duet Mashups. A new feature was added, the Battle mode. From now on, Duet Medleys never return again.

There are a total 13 Duets and 5 Battles:

Just Dance: Disney Party
Duets returned in this game, making it the second spin-off that features this mode. Like in Just Dance 2 and Just Dance Wii, the pictograms are individual and slide from different sides; however, they are all blue and have a sort of orange bracelet on their right arm, telling which hand the remote control must be held with. Gold Move ones have a golden glow behind their back.

There are a total of 9 Duets:

Just Dance 2014
Just Dance 2014 was the fourth game in the main series to feature Duets. The Battle mode remains in this game. Duet Mashups still didn't return.

There are a total of 16 Duets and 4 Battles:

Just Dance Kids 2014
Duets return in this game, which is the third spin-off game featuring Duets. Like both Just Dance 2 and Just Dance Disney Party 2, the pictograms are individual and slide from different sides; however, they are all light blue with white arrows and in a more cartoonish, bidimensional look.

There are a total of 7 Duets:

Just Dance Wii U
Duets have, once again, made another appearance in Just Dance Wii U. All of the features are the same from Just Dance 2014. This was the third game to feature Duets in the Japanese series.

A total of 10 duets are in the game:

Just Dance 2015
Just Dance 2015 was the fifth game in the main series to feature Duets. Duet Mashups have returned after a hiatus, but the Battle Mode did not return. The new Community Remix mode also features Duet routines.

There are 11 Duets, 1 unlockable, 3 Alternate routines, 4 Mashups and 2 Community Remixes:

Just Dance 2016
Just Dance 2016 was the sixth game to feature Duets. Duet mashups return from Just Dance 2015.

There are 9 Duets, 4 Alternate routines, 1 Just Dance Unlimited exclusive, and 1 Mashup.

Just Dance: Disney Party 2
Duets reappear in Just Dance: Disney Party 2, with the same assets as the previous Disney game; however, the pictograms are now purple with white arrows, and the Gold Move ones have a big star behind instead of a glow.

There are 7 Duets in this game:

Yo-kai Watch Dance: Just Dance Special Edition
Duets has made its fourth appearance in the Japanese series in Yo-kai Watch Dance: Just Dance Special Edition. The features are the same from Just Dance 2014 and Just Dance Wii U.

A total of 5 duets are in the game.

Just Dance 2017
There are 7 Duets, 6 Alternative routines, 3 Ubisoft Club exclusives, and 4 Just Dance Unlimited exclusives. Duet Mashups return from Just Dance 2016.

10 duets are available in.

Just Dance 2019
So far, there are are five duets in the game.

Just Dance Now
In Just Dance Now, Duets from all the previous games are featured, including Alternate routines and songs from Just Dance Unlimited. Also, some songs were remastered, and several Fanmades were added.

There are 62 Duets, 10 Alternates and 2 Fanmades:

舞力全开：活力派
This game features several songs from previous games of the main franchise, along with a few exclusive ones (however, only one of them is currently playable). The game features are the same as Just Dance 2017 and Now.

There are 15 Duets from the main franchise and 9 exclusive routines in 舞力全开：活力派:

Trivia
Duetos
 * Just Dance 2014 has the most Duets in the main tracklist (20).
 * William Tell Overture is the oldest Duet in the series, as the song dates back to 1829.
 * Nitro Bot is the only Duet that appears in the main tracklist of a game twice: it first appeared in Just Dance 2014, and then it was released in the following game as an Ubisoft Club unlockable.
 * Adoration To Happiness was initially planned to be a Solo routine, but this project was then scrapped and replace with the current Duet routine.