Check out GrowRPG, a great flash game/turn-based strategy/ experiment in chaos theory.

Basically, this is a game in which you build an RPG world turn by turn. So one turn you may "build" a forest, the next a mountain, the next a town. After everything is built, then the hero sets off on his pre-planned adventure through the world you just made, on his quest to slay the great evil. The outcome of his quest is determined not so much by his actions, but by the order in which you build features of the world. A forest that is grown earlier is denser, a town that is built near an ocean can construct shipyards while a town near a forest makes lumber mills, a castle that is well-fortified earlier can repel an attack while a weaker castle smolders.

What's interesting about it, besides being a fun game, is that it gets me to wonder to what extent success or failure is based upon individual actions/decisions, and to what extent it depends on circumstances. In each game, the hero does mostly the same things, but his world determines how well he does, or sometimes even how he does certain things. Play it. You'll understand what I mean.