A single actor (R. Parthiban) and one room — but it’s a gripping thriller. A suspect is interrogated for a murder, and his monologue slowly unravels the truth. Experimental but masterful.

Based on a true incident — a man forgets a few recent years after a cricket ball hits his head, but his friends try to get him to his wedding without revealing his amnesia. More thriller than comedy because of the high tension of lies collapsing.

A man stuck in a time loop on the day of a political summit. Unlike Western loops (Groundhog Day), this one is high-stakes, fast-paced, and explosive. Simbu delivers a career-best performance.

A woman with PTSD and agoraphobia is trapped in her house by a mysterious killer. The first half is eerie and atmospheric; the second half gets into a “video game respawn” gimmick.

Widely considered the gold standard of Tamil thrillers. A haunting, edge-of-the-seat cat-and-mouse game between a suspended cop-turned-filmmaker and a child serial killer. The first half builds the atmosphere; the second half is relentless tension.

Here’s a complete review of the best (as of 2026), covering their strengths, weaknesses, and overall watchability. 1. Ratsasan (2018) Genre: Psychological Serial Killer Thriller Rating: ⭐⭐⭐⭐⭐ (5/5)