Gary Barlow selected his acts in the Groups category with the help of Olly Murs in New York, while Nicole Scherzinger joined up with Mary J Blige in Antigua to choose the successful Girls.
Digital Spy presents a guide to the final six acts to make the Live Shows.
19-year-old Morrison's employee Abi has previously had experience doing small gigs at local venues in Guisborough. She is friends with last year's winner James Arthur after performing together, as they both live in the same area and have played local gigs. She writes her own music, and plays the piano and guitar.
She impressed the judges at the arena auditions with her self-written piano ballad about a personal heartbreak. She has since reunited with her ex-boyfriend whom the song was written after. She said: "I can't believe I'm through to the Live Shows and it still hasn't sunk in. I never anticipated getting this far. I'm really looking forward to putting my own twist on classics at the Live Shows."
Originally part of the duo Silver Rock, the judges decided to split 16-year-old Tamera and Jerrie Dila up after the Room auditions. In the arena auditions, Tamera forgot the words to her song, but was still able to progress to Boot Camp. She was able to impress Nicole Scherzinger enough to make her way to the Live Shows.
She currently lives with her mum and two siblings in Gravesend. She said: "I feel so blessed to have gotten through to the Live Shows: it's such a crazy feeling. I'm so lucky. How many people my age get this kind of opportunity? I'm going to love every second of it!"
Hannah is a 17-year-old student from South London, who started singing at her local church as a youngster. She amazed the judges at her Room audition, and was able to earn her place at Judges' Houses after a powerful performance of an Etta James classic.
The Greggs employee currently lives in temporary accommodation due to her difficult relationship with her mother at home, but has stated that The X Factor has brought them closer together. On making the Live Shows, she said: "I'm so overjoyed that I've gotten through to the live shows that I keep having out of body experiences. I didn't think I would get pass the room audition and now I'm at the Lives, it's so crazy my dream is becoming a reality. The stage is my home so I'm looking forward to getting on that stage and tearing it up!"
The Croydon trio - consisting of 24-year-old Kaz, Sterling, 25 and Joey, 27 - was formed five years ago, and currently live together in a three-bedroom house. They reached Judges' Houses last year, but were forced to drop out due to Kaz's visa issues. When it looked as if Kaz would not be able to sort out his situation in time again, he decided to drop out, with Sterling and Joey reaching Judges' Houses as a duo.
However, Gary Barlow decided that the group would be better as a trio, and invited Kaz to join his bandmates for the Live Shows. The boys have stated that they hope to provide a good example to young people living in difficult areas. Sterling said: "We can't even explain the feeling of having Gary as our judge. We used to watch Take That when we were younger."
Boyband Kingsland Road consist of Josh, 20, Connor, 19, Thompson, 22, Matt, 25 and Jay, 19. The five boys - three of them bartenders, one a waiter and one a sales assistant - previously lived in a shared house in East London, with three of them sharing one room. They hope to one day crack America like One Direction and describe their music as "dirty feel good pop".
Louis Walsh said at their first audition that they reminded him of a young Take That. They managed to lose their jobs and house after spending too much time rehearsing for Judges' Houses, and have stated that the show is "all or nothing" for them. Connor said: "When Gary paused and we were waiting for his decision; that felt like literally an hour. It was ridiculous!" Thompson added: "We didn't think we were through. He compared us to Take That, which was absolutely amazing."
This urban trio are formed of Jeanette, a 21-year-old beauty consultant originally from South Africa and now living in Romford, Rielle, a 16-year-old student from Manchester, and SeSe, a 22-year-old full-time mother from London. They auditioned separately, with SeSe being part of another group named Dynamix. Gary Barlow decided to form a new group after they impressed at the Arena auditions.
After just eight hours of rehearsals, the group impressed the judges at Boot Camp, and later moved in together and shared a bed at SeSe's house. Jeanette said: "It felt like Gary paused for an hour. He said, 'I don't know if it's going to work' and I just looked down. I didn't think we were through. I couldn't even look him in the eye. Afterwards I was like, 'Gary, you nearly killed me! Don't do that to us again!'"
X Factor Judges' Houses gallery - Girls and Groups get the good news: