In the thriller 'Buried', Paul Conroy (Ryan Reynolds), a truck driver and family man, wakes up buried alive in a coffin. With only a lighter and a cell phone, he must race against time to escape this claustrophobic death trap.
Ryan Reynolds wakes up nailed inside a coffin underground in Iraq with a cell phone. The phone is the entire film. No flashbacks. No surface. Cortés stays in the box for 95 minutes. The discipline alone is admirable; the result is genuinely terrifying.
Man wakes up to find himself locked in a coffin.
Like 'Exam', it presents a protagonist in a confined space trying to solve a life-threatening puzzle.