The Fourth Treasure Chest is the one that was behind glass that you just couldn’t get the first time. Just climb the rope, smash the glass with explosive or scream, and it is yours.

By the way, it is easier to cross the river as two Indy’s but you still need to raise up the bridge. I will explain later, but the other Treasure Chests are on that side of the bridge.

There is an alcove that has something that you can destroy, and then rebuild into a crawlspace. When you get up there, destroy all furniture and go to the left into a hall and you will find the Fifth Treasure Chest.

As you work your way down, pull a lever that you should have found up here. A gate will open, and you will have to work your way down and swim to the next area for the Parcel.

Don’t use the whipping platform yet, but instead go to the left of it and destroy the door. Pull the lever behind it, and you need to ride the elevator to the top. Go right, and destroy the door to your left. Instead this room are many cabinets. Keep destroying them until the golden key is in your hands. Go right and destroy that door, and insert the golden key in the mechanism. A new platform will rise.

Now go back down and get the Parcel. Take it to the elevator, and ride it up to the next level. Go all the way to the right edge of this platform and drop it. Hop down to the brown platform (the one you just raised) and use your whip to retrieve it. Hop to the next area, and drop the Parcel there. Jump over to the area across and to the right, and whip to retrieve it again. Nothing left to do but go to the ladder, drop down, and put the Parcel in the mailbox.

When you swim back, go to the place where you see a glass wall and two motor scooters behind it. Shoot or scream the glass out, and you will notice many orange cones appear. Get on one of the mopeds, and ride along until you pick up the cones. You will need to go across the bridge, but after you run over them all, you will have the Sixth Treasure Chest waiting for you in a nearby garage.