Season 4: 2010
The fourth season (called KBC 4) was hosted by the returning Amitabh Bachchan and started on 11 October 2010, on Bachchan’s 68th birthday. This season was telecast four days a week, Monday through Thursday evenings. The tagline of the season was “Koi Bhi Sawaal Chota Nahi Hota” (English: Every question is important. Literally: No question is small). The show moved from STAR Plus to Sony TV. The new logo designed for the fourth season incorporated the new Indian Rupee symbol, which was unveiled earlier in the year. The contestant tryout for the fourth season opened on 2 August 2010 at 9 PM IST. The total prize money for this season was ₹1 Crore, and a jackpot question for ₹5 Crore. The fourth season of the show was highly successful due to the return of former host Amitabh Bachhan. The season ended on 9 December 2010.
Season 5: 2011
Amitabh Bachchan returned to host the fifth season which premiered on 15 August 2011 on the Independence Day of India and ended on 17 November 2011. It was again aired four days a week. Compared to the previous season, there was only one major gameplay change: there was only a single milestone (the Padao) that the contestant chose. The tagline used for the season was “Koi Bhi Insaan Chota Nahi Hota” (English: No human is small. Literally: No person is inferior). This season was the generally viewed as the most popular show on Indian television in 2011. This season introduced a play at home segment called “Ghar Baithe Jeeto Jackpot”. This contest allowed home viewers to send an answer to a question via SMS during the show, with 1 Lakh Rupees going to the randomly picked winner, who can double or triple this amount by correctly answering further questions.
Season 6: 2012–13
The registration (contestant tryout) for the season started from 28 May 2012. This sixth season (labeled as KBC 6) was also hosted by Bachchan and premiered on 7 September 2012. It aired from Friday to Sunday evenings on Sony TV. The season ended on 26 January 2013. The tagline used for the season was “Sirf Gyaan Hi Aapko Aapka Haq Dilata Hai” (English: It is only knowledge that gives you your right). This season retained the 13 question format of the previous season.
This season, KBC started a new tradition of giving an advantage to socially excluded people, known as “Dusra Mauka”. Sonali Mukherjee, a victim of acid throwing, appeared along Lara Dutta in the first such special. On 13 January 2013, another special aired in which Manoj Kumar, a Mahadalit was accompanied by Indian actor Manoj Bajpayee. The winner of season 6 was Sunmeet Kaur.
Season 7: 2013
The rehearsals for the show began on 26 June 2013. Registration started from 8:30 PM on 27 May 2013.The seventh season (called KBC 7) was also hosted by Bachchan entitled “Seekhna Bandh Toh Jeetna Bandh” (English: If Learning stops, winning stops or simply: Learn to Win) was used as the tagline for the season. The total prize money was increased to ₹7 Crore, and the number of questions increased from 13 to 15. The season was commenced on 6 September 2013.The season had a few changes, including a new lifeline called Power Paplu. This lifeline allowed the contestant to reuse a lifeline that was previously used on another question. (It could not be a lifeline that was used on the current question. For example, a contestant could not use “Ask the Audience”/”Audience Poll” twice on the same question.) Double Dip and Ask The Expert were discontinued and in lieu 50:50 and Flip The Question (also known as “Switch” or “Switch The Question”) were revived. The Phone-a-Friend was extended to 45 seconds. The prize for jackpot question was increased to ₹7 Crore. The Kaun Banega Crorepati 2013 set was a 360-degree multimedia stage. The final four questions were a part of Sapta Koti Sandook (English: The Seven Crore Jackpot) that let contestants win from ₹1 Crore, ₹3 Crore, ₹5 Crore and finally ₹7 Crore. The system of Fastest Finger First was also altered. Instead of playing one question, the winner of the leader board formed at the end of three questions, sits on the Hot Seat. (i.e. the player who answered the most questions correctly in the shortest amount of time).
Season 8: 2014
The highest winning prize of this season was also ₹7 Crore. The registrations of KBC 8 were commenced on 22 July 2014 and the shooting started on 2 August 2014. Shooting of the entire show was held in Surat. This was the first time that KBC was shot outside Mumbai. The format underwent minor changes for the season, with the number of questions reduced to 14, the Double Dip replacing the 50:50, as well as the Flip being replaced by the Triguni (Three Wise Men) lifeline. The Phone-a-Friend was shortened down to 30 seconds and the original Fastest Finger First system (as used for seasons 1 to 6) was reinstated.
The grand premiere episode of the series premiered on 17 August 2014 (Sunday) at 8:30 PM IST for 3 hours. The season aired from on Monday through Thursday evenings. Initially running for 1.5 hours, the program reduced to an hour. The season ended on 6 November 2014, and aired its two grand finale episodes on 9 November and on 16 November 2014. The tagline for the season was “Yahan Sirf Paise Nahi, Dil Bhi Jeete Jate Hain” (English: Not only money here, hearts are also won). Three special guests appeared in the grand premiere episode: television comedian, Kapil Sharma from Colors TV’s television series Comedy Nights with Kapil, Dayanand Shetty and Aditya Shrivastava from Sony TV’s television series CID, and finally Rajput hero, Maharana Pratap a.k.a. Faisal Khan from Sony TV’s television series Bharat Ka Veer Putra – Maharana Pratap gave a stellar dance performance. Among others the Shillong Chamber Choir led by Neil Nongkynrih performed a medley of evergreen songs of Bollywood followed by a patriotic song at the opening ceremony of KBC8.
Season 9: 2017
KBC returned to air with Bachchan resuming hosting duties as it premiered on 28 August 2017 airing on Sony TV. The tagline of this season was “Jawaab dene ka Waqt aa gaya hai” (English: The time has come to answer). The show aired from Monday to Friday at 9:00 pm. The season introduced a 16 question format, where the first 10 questions are timed (45 seconds for the first five questions and 60 seconds for the following five questions). The 50:50 lifeline replaced Double Dip and the Three Wise Men lifeline was replaced by the Plus One (from the United States version). Phone-a-Friend (now sponsored by Jio) introduced video calls. In case the contestant reaches the 16th question (Jio Jackpot Question), then the contestant cannot use the remaining lifelines. The last episode of the show was aired on 7 November 2017. Reportedly, with 19.8 million registrations, the show stood at the top of TRP ratings for the Indian television industry.
Season 10: 2018
The show started registration on 6 June 2018 and started airing on Sony TV from 3 September 2018. The tagline for the tenth season is Kab Tak Rokoge (English: How long will you stop). In this particular season, the Phone-a-friend lifeline was replaced with the Ask The Expert lifeline
Season 11: 2019
KBC returned to air with Bachchan resuming hosting duties as it premiered on 19 August 2019 airing on Sony TV. In this season the show’s tagline would be Ade Raho (Translate- Keep standing). The show currently airs from Monday to Friday from 9 to 10:30 pm IST (Special episodes named ‘Karamveer Special’ air every Friday till 11 pm IST).