• Map exploration : When you first enter the Tangwan map, you will encounter a conspicuous mysterious box under the guidance of the main mission.
• Buy in the store : To open the mysterious box, you need a key. Search patiently in the store in Tangwan, where the key will be waiting.
• Puzzle-solving adventure : Going deep into the [West Cliff Secret Realm], you will encounter a set of hidden pillar puzzles. After solving them, the location of the next box will be revealed.
• Laboratory 13 : Go to the laboratory's office and after completing the mini-game, you will encounter the third mysterious box. Note that the password 0415 is required to unlock it.
• Not only tells you how to open the box, but also shares the ways to obtain it to help you successfully complete the challenge!
These are the detailed steps to open the mysterious box in "Codename 56". I wish you great success in the game world!