Module 1, which includes the longer Race track and the new Supporting dice, makes for a longer and more exciting game, as Camels may move twice per Leg now. Also, you may spice this module up with an additional action.
Module 2 includes the Photographer and gives rewards for correctly predicting the movement of Camel stacks.
Module 3 introduces bets on positions, which makes betting more flexible.
Module 4 introduces Betting Partnerships, which allow players to cooperate more openly in games with 6 or more players.