Game with Strategy Setting

One of my coworkers has been discussing things to entertain our coworkers. One of his ideas is to do some sort of game. Something where everyone can specify your strategy and a program runs it to see who does the best. I know crobots and core wars do this but they are very much programming games. Something that seems less programming like would be better. Do you know of any games like this? Open source is obviously preferable. I could see doing an Oregon Trail like game this way. Specify what you buy at start and strategy for survival. It doesn't need to be a one and done. It could have multiple phases but not too many as probably some people will drop each time.