The craze for 'Kaun Banega Crorepati' is back as the original host Amitabh Bachchan returns with the fourth season of the quiz show. Sony Entertainment Television opened the phone lines for KBC 4 on August 2 at 9 pm and it received more than 5 lakh calls in the first 15 minutes from all over India for the question asked by the host Big B.

Since then, he asked a new question everyday for eights days. The total number of callers has now reached to five crore, as per the channel's data.

The head of marketing, Sony Entertainment, Danish Khan admits that it is their strategy to attract more audience to the 9 pm slot. He said, "Considering the popularity of KBC, we knew lots of viewers would call up to answer the questions to register. Hence, we thought to bring a new question everyday to increase the reach of the show".

This season has introduced a new procedure for registration. The process starts when the callers answer the questions on the phone and register their name and communication details with the channel.

The software records the detail automatically and selects randomly some people, who can appear for the auditions to be conducted in six Indian cities including Mumbai, Delhi, Nagpur, and Lucknow from September 1 to September 6.

The participants need to undergo auditioning procedure consisting of a written test as well as a videoconference meeting with Amitabh Bachchan.

The collective scores of both the tests would select the first 10 players to take part in the Fastest Finger First on the show. The show will start on October 11 on the birthday of Big B at Sony Entertainment Television.