Big Brother Brazil 15 is the fifteenth season of Big Brother Brazil.
Big Phone - Similar to previous seasons, whoever answers the Big Phone will either receive the power to nominate someone secretly or will be automatically nominated themselves.
Dispute for the last vacancy - Initially the program counted on thirteen participants, but soon in the second day of program, Aline Gotschalg and Julia Barboza, two candidates for participant, entered the house for meetings for the fourteenth wave of the season. Aline, with 53% of the votes, was chosen by the public to continue in the confinement.
Rules Changes - This season, the Head of Household back to be eligible to compete in the next HoH competition after his leadership, having the chance to be HoH multiple times in a row. Also, he/she gains R$10.000, the Power of No and the right to divide the housemates into two teams for the Food competition. However, for the first time since BBB started, the HoH has no immunity in the nominations, becoming vulnerable to being nominated by the house vote.
You're in Control! - Big Brother introduced a new way to give more power to the audience, calling it Você no Controle. Every week, producers pose a question and the public must vote between two options. The voting usually is opened on Friday and finishes on Sunday.
Walked from Tamires - Participant Tamires Peloso gave up the game on the afternoon of March 8, 2015. In the confessional, the dentist explained that she was very homesick and that she no longer felt well inside the confinement. It was the first time in the history of the BBB that a participant asked to leave the game less than a month of the final of the program, that would happen on April 7, 2015.  Due to the closure of the program final, a new entrant was not scheduled to replace Tamires in the game. After the departure of Tamires, a voice, supposedly of Boninho, had a serious conversation with the participants. In his speech, released by audio in the house of the BBB, spoke about the desistência and the seriousness of the game. Strong phrases demonstrated the discontent of TV Globo's director of genre and former director general of the attraction, who reinforced: "Who wants to leave is super simple, it's easy, just put the bag there and you enter the confessional and ... PUM !, disappeared from our life, disappeared from our history, died for us ".