It was like this from film one thought; Dr Gordon's task was to kill Adam via a poisoned cigarette. Adam's task was to stop him.
I love this film series. Number one was suberb - spesh the twist at the end. I would rank them
1
3
2
5
7
6
4
Except Jigsaw was on the floor in the room, if they had checked if he was actually dead it would have been entirely different. The other situations are always that people are fighting against each other and someone's definitely going to die. I think it would have been better if everyone would have the chance to survive if they would do things correctly. The 2nd and 3rd both had that kind of thing.