Lego Indiana Jones 2: The Adventure Continues Hints for Xbox 360
On the first kingdom of the crystal hub, go into the train bonus level as a girl. All you have to do is jump and collect the studs above you. BE CAREFUL!!!! If you fall off you lose the studs. Then go to the left of the train and jump down the hole. You will now keep the studs.You can go back and do it again an infinite number of times.
Hope this helps