Hmmm it isn't a saw film as in the film i am talking about the room they are in is spotlessly clean as opposed to Saw 1/2. And it's not any of the cube films either.... Hmmm... This is a bit more detailed synopsis:
3 possibly 4 seemingly random people are in a room, (possibly they all just wake up in the room with no recollection of getting there,) I think from my memory they might be there to do some kind of questionnaire / survey. The room there are in is a spotlessly clean room with only a table in, it possibly has a door and a viewing window where they are being watched. A gun is then given to them through the door, that gun is used to shoot one of the characters eventually. They soon find as far as i can remember hidden messages warning them etc, then they try and escape but to no avail. Eventually the remaining characters are gassed to death, and random people in fully protective suits come in to collect the dead bodies.
Any ideas anyone?