Tod Sa Gun Game

Main format

In the primary game format, a single contestant faced a sequence of celebrity or historical faces projected onto a video wall. To capture the maximum jackpot of 10 million Baht, the player was required to correctly identity all 10 faces consecutively without making a single error.

Face-to-Face (One-on-One) format

In the face-to-face iteration, two contestants directly competed against each other. Each player was tasked with identifying as many faces as possible within a strict one-minute time frame. A player maintained control of the board as long as they provided correct answers consecutively. If a contestant erred or passed, control passed to their opponent. The base jackpot started at 1 million Baht, with an additional 1 million Baht added to the prize pool for every month a contestant successfully defended their championship title up to a maximum cap of 10 million Baht.^[1]

Tod Sa Gun Game era (2003–2008)

• Thotsakan (เกมทศกัณฐ์): The classic baseline standalone format (April 1, 2003 – October 28, 2005).
• Thotsakan Yok Thap (ทศกัณฐ์ ยกทัพ; The Tag Team): A three-person team format where representatives faced opponents in knockout face-guessing rounds. If a player missed an answer, they were eliminated and replaced by a teammate. Winning 10 consecutive series unlocked a progressive picture-unveiling jackpot game worth up to 30 million Baht (October 31, 2005 – December 29, 2006).
• Thotsakan Chamlaeng (ทศกัณฐ์ จำแลง; The Disguise): Shifted back to individual play but introduced a puzzle hook. Contestants were presented with a cryptic keyword alongside two distinct faces and had to deduce which individual matched the provided clue (January 1 – June 15, 2007).

Special tournaments

• Thotsakan Suek Thotsakan Na Thong (ทศกัณฐ์ ศึกทศกัณฐ์หน้าทอง; The Golden Mask Showdown): An elite bracket in 2005 that invited prominent, long-reigning champions back to the studio for a head-to-head tournament. Winners were awarded a commemorative golden Thotsakan mask trophy and a 1 million Baht cash prize.
• Thotsakan Chuay Khru Tai (ทศกัณฐ์ ช่วยครูใต้; Help Southern Teachers): A special charity run featuring local celebrities playing to secure grants and financial support for educators working within the conflict-affected southern border provinces of Thailand (June 18, 2007 – February 15, 2008).

Yok Siam era (2008–2011)

In late February 2008, the program underwent a radical structural overhaul, rebranding as Thotsakan Yok Siam (later shortened simply to Yok Siam in April 2008). The face-recognition mechanics were replaced by team-based provincial representation. Teams representing the 76 provinces of Thailand competed in a massive knockout tree answering multiple-choice questions focused on Thai history, regional geography, and local cultural heritage. Because the core face-identification motif was eliminated, the "Thotsakan" name was dropped entirely from the broadcast title after June 2008.^[1]

• Yok Siam 100 Kho (100 Questions): Broadcast from March 1 to June 2, 2010.
• Yok Siam 10 Kho (10 Questions): The final condensed broadcast cycle, running from June 3, 2010, until the series finale on February 28, 2011.