In Istanbul, you lead a group of one merchant and four assistants through 16 locations in the bazaar. At each such location, you can carry out a specific action. The challenge, though, is that to take an action, you must move your merchant and an assistant there, then leave the assistant behind (to handle all the details while you focus on larger matters). If you want to use that assistant again later, your merchant must return to that location to pick him up. Thus, you must plan ahead carefully to avoid being left with no assistants and thus unable to do anything... Istanbul - Big Box is the all-in-one package for Istanbul, including the base game as well as both expansions, Mocha & Baksheesh and Letters & Seals. It also includes the Istanbul: Caravan Leader Mini Expansion, in the form of a small tile rather than a camel meeple. This combination also gives players the option to play on a big 5 x 5 tiles bazaar.