Investment simulation/model game.

hi... trying to find out if someone in yc land has any pointers/contacts with anyone who's created a functional web based app for an investment simulation/game. basically, i'm talking about a situation where a user can create a fictitous company, and others can then invest in the company using "chips/points".. there is no exchange of real dollars/cash, so this isn't an attempt to rip someone off or make cash as in a ponzi scheme.. i'm looking to be able to do large scale modeling, so i need a basic investment process.. any thoughts/comments would be appreciated! thanks.. tom