Format

Under the original format, the guest artist(s) can eliminate mystery singers after each round, and ended with the last remaining mystery singer depending on the outcome of a duet performance by themselves.^[1]

At the end of each round, the eliminated mystery singer gets a consolation prize starting with ₱5,000 for the first round, ₱10,000 for the second round, and ₱15,000 for the third round. If singer is good, the guest artist wins an award (as Eyeward)^[6] and he/she will compete at Tawag ng Tanghalan. The winning singer, regardless of being good (SEE-nger) or bad (SEE-ntunado), wins ₱25,000.

Rounds

Each episode presents the guest artist with six people whose identities and singing voices are kept concealed until they are eliminated to perform on the "stage of truth" or remain in the end to perform the final duet.

Summary

Gary Valenciano is the only guest artist to both played in premiere and finale episodes.^[2][4] It is also the first time in ICSYV franchise that an entire cast (by host Luis Manzano and SING-vestigators Wacky Kiray, Kean Cipriano, Alex Gonzaga, Andrew E., Angeline Quinto, and Bayani Agbayani) has been played on episodes for their respective "birthdays".^[7]

This season did also celebrate its first anniversary (subtitled Unang Laugh-Laugh-fun) by airing a special episode, with Daniel Padilla playing on entire Kalokalike alumni.^[8][9] It also aired the first episodes featuring an entire lineup of celebrities (with TNT Boys),^[10][11] pairs (with Marcelito Pomoy),^[12][13] and groups (with TJ Monterde [tl] and KZ Tandingan)^[14] as mystery singers.

Best Mode (September 9, 2018)

As part of the show's first anniversary, this prelude special includes behind the scenes and rankings on mystery singers' performances for the past 98 episodes.^[15]