Instructions
Collect the 10 treasure chests within the main storylines for the "Raiders of the Lost Ark", "Temple of Doom", "Last Crusade", and "Kingdom of the Crystal Skulls" parts one, two and three.
Play through and complete the super bonus levels at the end of each chapter. Once you have collected the 10 treasure chests within a chapter, you will gain the ability to play the super level. There are six super bonus levels in all.
Enter the Warehouse and walk up to the final crate. An icon will appear over the crate. Press the "X" button to unlock the crate.