Lego Indiana Jones Game 58: Into the Mountains, Free Play
Once you have left the bar, go outside and go to the left. There is a door that you will need to be a soldier in order to get through. Go ahead and put on a soldier disguise and get past this area. A door will open. Go on inside and climb up the ladder. Take the box of pieces, jump down, and drop it on the green platform. You can build yourself something that will make the platform become a whipping platform. If you whip it, then another character should jump on the rope to the left.
Santa Claus will show up, and he will quickly leave. Go back outside, and you will see the Parcel waiting. Pick it up and throw it into the mailbox.
Near where the llamas are penned, and you will find a place to dig. It will actually be several places to dig, and from there will be the parts to build a snowmobile. Once it is assembled, get on and head right through 5 posts. The Sixth Treasure Chest will be uncovered. I may have mentioned this one before in the first time.
If you keep going right, there is a door that is barred by silver bars. Use the explosive character and blow it open. Go in and go to the window, and you will find the Seventh Treasure Chest.
Keep going until you come to a point where there are two big Lego ice rocks. This is just after you blow open a gate to get to the next section. Go ahead and blow the one to the right up, and then turn into a small character (Short Round, Slave, Maharajah) to get through a crawlspace. You will emerge out the other side, and you can become Indy to use the whipping platform and get the Eighth Treasure Chest.
Soon you will come to the area where the path comes out from under you, three times, in fact. Go ahead and fall down to the area down all the way down below, and a woman character can help you leap to where the Ninth Treasure Chest is, encased in ice. You can use the screaming woman (Willie or Dancing Girl) or an explosive character to bust the shell and get it.
By the way, the Third Secret Character is also accessible here. You may have noticed him hanging upside down, and breaking the Treasure out is how to free him.
Keep going until you get to the door before the Final Stage. It will have torches on the sides, and some hieroglyphics all the way to the right. Turn into a character that has a book of hieroglyphics and translate them. You will have the Tenth Treasure Chest, and you can Save and Exit.