So I was playing through the entire Half Life 2 saga the other weekend and I just thought to my self:"How awesome would Crysis be if it used its physics for puzzles"

Think about it,if it had a puzzle within each bottleneck in the game,for example the narrow valley at the beginning of the game,the mine,the aircraft carrier.
And maybe you shouldnt force players to solve puzzles,as not everyone likes them,in that case,have them for hidden weapons and such.

I do not see a natural way to incorporate this into Crysis 2,as it is set in a city. That is, unless there are rebels and the like.
But should Crytek go back to the jungle its a must,as it is the most obvious place for these things.