{Not mine. This is a TV show that diffused from 2008 to 2014. All credits for the ideas are going to the directors of the show.}

"Contestants compete through four rounds of competition until a final winner is chosen. The first round features 24 contestants running through a series of obstacles.
The top 12 best times move on. 

The next two rounds eliminate half of the 12 contestants, leaving six of them, and then eliminates three last contestants in a third round.

There are then only three left,the top three. They will be put in a last obstacle course, where only the best timer shall win."

Now let's take this concept,but put a darker twist to it.
'Cause that's the kind of person I am.

All the eliminated contestants dies in the course. But, the surviving ones doesn't know, until the top three is formed.
They are then told that only one of them shall survive in the last obstacle course; in which there'll be deathly falls and traps.

But what happens if two of them get attached to eachother? Or heck,even the three of them?