The code to open the vault in the Iceberg Lounge during the Carmine Falcone mission is 596. Inputting this three-digit combination unlocks the secret door and rewards you with the 'building bridge' Red Power Brick, a crucial collectible for unlocking extras in the game. This isn't a code you can guess; it requires finding two separate paper clues hidden within the level and combining them logically.
While many puzzles in LEGO® Batman™: Legacy of the Dark Knight involve smashing and building, this one requires a bit more detective work. The solution is elegantly simple once you understand the trick, but finding the components is part of the challenge. This guide will walk you through finding both clues and cracking the code to claim your prize without the headache.
Where Is the Vault Located?
The vault itself is found deep within the Iceberg Lounge, well past the initial nightclub floor and the chaotic kitchen sequence. After navigating the funhouse area and witnessing a confrontation between Carmine Falcone's goons and the Red Hood gang, you'll find yourself in a more industrial-looking back area. It's here, amidst crates and machinery, that you'll discover a conspicuous-looking puzzle mechanism next to a large, reinforced door. This is the vault.
The mechanism is a numerical input device. Nearby, you'll spot a strange contraption with shifting numbers, which is a key part of the puzzle's environment but can be a red herring if you overthink it. The true solution lies not in manipulating this device endlessly, but in finding the two physical clues that tell you exactly what to input.
How to Find the First Clue: '59X'
The first piece of the puzzle is practically handed to you, but it's easy to miss its significance early in the mission. You'll acquire it shortly after your first encounter with Selina Kyle. After Batman and Commissioner Gordon make their way past the club's main floor, Selina slyly helps them access a back route to Falcone's office.
LEGO® Batman™: Legacy of the Dark Knight in-game screenshot
As you proceed down the indicated path, you will find a small, seemingly innocuous piece of paper lying on the ground. Picking it up reveals the first clue: the sequence '59X'. At this point in the level, the 'X' is a mystery. It's a placeholder, and without its counterpart, the clue is incomplete. Many players might collect it and forget about it, but this scrap of paper is the first half of the key. Make a mental note of it and continue your infiltration of Falcone's criminal enterprise.
How to Find the Second Clue: 'X96'
The second clue appears much later in the level, right in the same room as the vault you're trying to open. After the funhouse sequence and the brawl involving the Red Hood gang, you'll enter the area with the vault mechanism. The room is designed to make you focus on the complex-looking number machine, but the real prize is another piece of paper.
LEGO® Batman™: Legacy of the Dark Knight in-game screenshot
Explore the corners of this room thoroughly. Tucked away near the vault's input panel, you will find the second paper clue. This one reads 'X96'. The symmetry with the first clue is immediately apparent. You now have two pieces of a three-digit code, each with a placeholder 'X'. One note gives you the first two digits, and the other gives you the last two. The puzzle is now one of logic, not just exploration.
Cracking the Code and Getting Your Reward
With both '59X' and 'X96' in your possession, the solution becomes clear. The puzzle requires you to mentally overlay the two clues. The first clue, '59X', establishes the first digit as '5' and the second as '9'. The second clue, 'X96', establishes the second digit as '9' and the third as '6'.
5 9 XX 9 6
When combined, they seamlessly form the complete code: 596. The shared '9' in the middle position confirms that you're on the right track. Approach the vault's numerical input panel and enter the digits 5, 9, and 6. The heavy door will swing open, revealing the prize inside.
LEGO® Batman™: Legacy of the Dark Knight in-game screenshot
Your reward for this piece of detective work is the 'building bridge' Red Power Brick. Like all Red Power Bricks in the game, this collectible unlocks a powerful and often comical extra that can be purchased and toggled on. These bricks are essential for 100% completion and for making subsequent playthroughs of levels much easier and more entertaining. Collecting this one is a satisfying conclusion to one of the mission's most clever environmental puzzles.
A Final Tip
This vault puzzle is a great example of how LEGO® Batman™: Legacy of the Dark Knight evolves the standard LEGO formula. It encourages you to pay attention to small details in the environment rather than just smashing everything in sight. While breaking bricks is still a core part of the fun, the game rewards players who slow down and think like the World's Greatest Detective.