Contest Winners: On Just Dance 2, Ubisoft had a contest allowing players to create their own choreography to When I Grow Up. The top 3 were allowed to come to Ubisoft and have their choreographies go through the process as regular choreographies. These can be found under "Extras".
Alternate choreographies: These are choreographies that are not on the main menu, and are simply a different dance to the same song with no theme or anything special about it.
Extreme versions: These are choreographies where the coach moves very quickly and does more complex moves. In Just Dance 3 the difficulty is 3 and the effort is 3, in Just Dance 4 the difficulty is 4, and in Just Dance 2014 the difficulty is Hardest.
Sweat versions: This is where the coach does moves that are meant for working up a sweat. There is one in the main game for Just Dance 3, and some DLC songs can be thought of as sweat versions, all by the Sweat Invaders. There are no sweat versions in Just Dance 4, but there are 10 in Just Dance 2014, one being DLC and another being a Ubisoft download.
Hold My Hand: This is a mode only available for Wii, Wii U, and PlayStation 3 where two players share a Wii remote or PlayStation move remote. There can be up to 5 players with 4 remotes. There's two in Just Dance 3 and one in Just Dance 4.
Line Dance: This is where three people do line dancing. All three people do the same moves in Just Dance 4, and it is treated as a Solo mode of sorts. It later made a reappearance in Just Dance 2016, but as a Trio routine.
With a/an _____: This is where a dancer dances with a certain object. Can be difficult for the Wii, Wii U, and PlayStation 3 because of the need for a remote. Sometimes the remote has to be treated as the object. Just Dance 4 has two of these and Just Dance 2014 has one.
Themed Alternates: These were introduced in Just Dance 2014 and have a specific theme to it.
On-Stage Mode: These are exclusive to Just Dance 2014 and have a lead dancer that lip-syncs the song and two back-up dancers. Lyrics appear in the top middle during normal gameplay (positioned normally in World Dance Floor). This was split off into Trio routines and Sing-Along modes in later installments.
Fanmade: Introduced in Just Dance Now, this is where someone makes their own choreography and sends it to Ubisoft. Unlike the Just Dance 2 contest winners this does not receive any special effects or the high score saves.
Sing-Along Mode: These were introduced in Just Dance 2015. The lyrics appear at the top center of the screen instead of the usual bottom left. The coaches of these routines can be seen lip-syncing to the song.
Just Dance VIP: This is where a celebrity or person relevant to the song dances the choreography in lieu of the regular dancer.
Community Remix: Same as Just Dance VIP but instead of a celebrity it is a combination of several different average players' videos.
Ubisoft had a contest allowing players to create their own choreography to When I Grow Up. The top 3 were allowed to come to Ubisoft and have their choreographies go through the same process as regular choreographies. These can be found under "Extras".
It can be unlocked by pressing UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT at the title screen for Just Dance 3 (Note: This method will not work for the PlayStation 3, as it cannot be unlocked.)
Sing-Along mode replaces On-Stage mode. It can simply be a different choreography with the lyrics in the top middle or it can be a Trio where the lead "sings" with and the others are back-up dancers.
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