Lego Indiana Jones Game 68: Castle Rescue and Motorcycle Escape, Free Play
The first treasure chest in Free Play is obtained by blowing up four silver armored knights. The first one will be on the right as you come in. The other two are in the next area, and I believe they are the ones holding the red shields.
As for the last one, you will need to become a Thugee worshiper and stop by the statue in this area. A bookcase will slide away. This next room is quite big, and destroy the knight with the red shield to reveal the Seventh Treasure Chest.
You can get the Parcel here this way too. Go ahead and blow up the other knight’s armor here, and you will find pieces to a mechanism that you can build. This mechanism will cause a rope to go down, and if you jump on the rope, a doorway will be open to reveal the Parcel. Nothing to do but mail it.
There are some file cabinets in the corner that can be destroyed, and you will find pieces of a crawlspace entrances. Go ahead and reassemble them, and you will have the entrance a smaller character can use to get to a balcony with the Eighth Treasure Chest.
This next Treasure Chest can be found on the area where the crane is. You will see a shining silver box, and you can turn into an explosive character to destroy it. Turn into a woman character to make the jump over, and get the Ninth Treasure Chest.
In the room that is on fire, work your way up to the area with the multi-colored table by the fireplace. You will see a crawlspace entrance located behind some books. Destroy them, and crawl through to get the Tenth Treasure Chest. Go ahead and save and exit.
In this first area, you will notice a motorboat with a silver tether to it. Blow it up with some explosive, and take the boat and go to the right. You will be at an area with several cases and a treasure chest. Go ahead and turn to a woman character to jump up and grab the Seventh Treasure Chest.
You should see a silver gate that is padlocked shut. Go ahead and explode it open and walk in and go into the corner where there is a checkered brick. Put it down in the highlighted area, and you will be able to move an orange handled thing. The floor will open up, and you can grab the Eighth Treasure Chest.
You will soon come to an area where there is a treasure chest behind some silver bars. Destroy the silver bars and claim the Ninth Treasure Chest.
When you go into the one house, you will find a tractor that is only there if you are playing the game in Free Play mode. Go ahead and fix that broken tractor and get in. You should be able to go anywhere outside, and the bad guys won’t chase after you for some reason. Go ahead and go to the garden areas, and you can run over a whole lot of planted areas. You will find three carrots, and when all of them are found, the Tenth Treasure Chest will appear at the bridge.
As for the Parcel, go ahead and go to the windmill, where you will find a key. Take the key and put it in the mechanism, located on the left part of the mill. Give it a spin, and eventually a case will come out the front. You can put the case on the green area, and then turn to a woman character to retrieve the Parcel. You can then put it in a mailbox.