Killer film with a merry go round.

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Looking for a movie I found on Netflix. I cant remember the name but all I know is a group were held in like an underground place, strapped to a merry go round. A man had to choose between shooting the person the gun landed on or having his fingers crushed. I remember the man left 2 people alive. He may have known all the victims. Please help me find this movie.



A system of cells interlinked
I think that is Saw V...but it might be IV.... I saw III recently, and it isn't in that one.
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“It takes considerable knowledge just to realize the extent of your own ignorance.” ― Thomas Sowell



Yeah, I'd just start with Saw 3 on Wikipedia (or one one of those sites that lists all the Saw traps) and go through them, sounds like one of those.



Thank you so much