These are always LOADS of fun. I've done different ones - the best was probably at DB where we traded "metal" - some teams could mine it, some could process it into goods, and some could only trade the products. Other ones I've done - at UBS there were four boards in the corners of the room (Equities, Bonds, Gold etc) and a TV screen with incoming news in the centre. Citi we had a bottle of wine (covered so we didn't know the price) and we had to trade bottles of wine with each other - not knowing what the price would end up being but getting news updates every so often. Morgan Stanley has an awesome trading game - the most professional of the lot - where they set you up with computers and screens, with incoming news broadcasts and a decent variety of products to buy/sell. VERY COOL. Portfolio in Peril, I think it was called.
One thing to watch out for: make sure you trade in the same direction that other people do. A lot of the people there don't have a clue so this won't necessarily be the direction you automatically think. For example, at UBS - news came in that interest rates had been hiked so I immediately thought . . bonds will drop . . I'll get rid of my holdings before the others catch on (prices were determined by how many people bought or sold - not the news per se) but annoyingly people misinterpreted this and thought this news meant bonds would go up . . . so they bought loads . . . which DID force the price up and meant I lost out. Obviously this wouldn't happen in real life and perhaps the people at your AC will be a little more into it but just keep an eye out for this!