Problem

For the Becky G and Will.i.am song on Just Dance Kids 2014, see Problem (The Monster Remix).

"Problem" by Ariana Grande ft. Iggy Azalea & Big Sean is featured on Just Dance 2015 and Just Dance Now.

Appearance of the dancer
The dancer wears a dark purple visor, light blue headband, round, dark purple hoop earring on her left ear, a light blue jacket, a purple shirt, dark blue and pink checkered dress and white and purple shoes. She has long pink hair put in a ponytail.

Background
Colorful and brightly-colored shapes, circles, triangles and lines appear like in I Kissed a Girl. At some points colored lips appear. Before the chorus colorful glass shards appear. After Iggy's part, a colorful aura appears before the dancer. In the chorus flashing boxes and lines appear and disappear on screen to the beat.

Gold Moves
There have been 2 Gold Moves revealed for this routine.

Gold Move 1: Lift your leg up and cross your arms as you hit them toward the ground (akin to Just Dance's Sweat Version's Gold Move)

Gold Move 2: Put your right hand on your hip and your left hand on your head before swiftly moving your torso in a circle. 

Appearances In Mash-ups

 * Love Me Again (JD2015) Ex-Girlfriends
 * Walk This Way (JD2015) Ladies Only

Trivia

 * This is the first Iggy Azalea song in the series,the second is Black Widow by Rita Ora featuring Iggy Azalea; however, this is the third Ariana Grande song in the series, the first being The Way in Just Dance 2014, the second being Put Your Hearts Up in Just Dance Kids 2014, the fourth being Bang Bang and the fifth being Break Free as a free DLC, both also in Just Dance 2015.
 * This the second song that Big Sean is featured. His first featured song is Wild with Jessie J.
 * In Just Dance 2015, Big Sean is credited as the "whisperer" in the Problem chorus. But in the official soundtrack, only Ariana Grande and Iggy Azalea are the credited artists of the song.
 * This is also the first Ariana Grande song to be a Solo mode, along with Break Free.
 * The dancer looks similar to the dancer in Just Dance.
 * This is the first song in JD2015 menu in the order.
 * The choreography is inspired by Ariana Grande in the music video and concerts.
 * If players has sensitive eyesight, they should be careful watching this because the background can cause eye damage or seizures in people with epilepsy due to the bright colors and the flashing triangles and boxes. The flashy circles (like yellow, bright green and etc) are also too bright and actually glow too much and that also causes epilepsy
 * This song has a Community Remix Contest Mode.
 * The icon contains an unknown dancer with another disco ball for a head.
 * Some elements of the background, like the flashing lights, follow the beat of the song.