The “GCDP puzzle” in LEGO Batman: The Legacy of the Dark Knight is the Cluemaster “Solve the Mysterious Puzzle” mission that takes place near the GCPD building in Old Gotham North. You don’t type a code; you rotate icon dials until they match a sequence shown on a clue wall, then hit the button to unlock the puzzle and open all Cluemaster areas.

Where the GCDP / Cluemaster puzzle is

  • Location: Old Gotham North , on Central Island , just east/northeast of the GCPD building.
  • Mission: “Dynamic Duo” story mission – you play as Robin and talk to the puzzle on Central Island to start it.

What the puzzle looks like

You’ll see:

  • A wall with a clue image showing a sequence of icons.
  • A floor puzzle with four rotating dials , each showing different symbols (often stylized numbers 1–4, but reflected / mirrored).
  • A button next to the dials to activate the mechanism once they’re set correctly.

The key fact from the community: the symbols on the dials are numbers 1, 2, 3, 4 reflected next to each other. The clue wall shows the target sequence in order: 3‑1‑4‑2.

Step-by-step: how to solve it

  1. Start the mission
    • Play the “Dynamic Duo” story mission.
    • As Robin , go to the Central Island puzzle near the GCPD and talk to it to start “Solve the Mysterious Puzzle.”
  1. Read the clue on the wall
    • Look at the picture/clue on the wall next to the puzzle.
    • It shows a sequence of 4 symbols in order: 3, then 1, then 4, then 2.
  1. Use Robin’s abilities to rotate the dials
    • Use Robin’s staff to hit or interact with each dial and rotate it.
    • Each dial has multiple symbols; you need to stop each one on the correct number from the sequence:
      • Leftmost dial: set to 3
      • Second dial: set to 1
      • Third dial: set to 4
      • Rightmost dial: set to 2
    • Because the symbols are mirrored/reflected, focus on recognizing the shape that corresponds to each number (1, 2, 3, 4) rather than trying to read them as normal digits.
  1. Activate the puzzle
    • Once all four dials match 3‑1‑4‑2 , press the button next to the puzzle.
    • If the lights turn blue / the mechanism activates, the puzzle is solved.
  1. Collect the reward
    • After activation, the puzzle opens and you get:
      • A Cluemaster trophy / collectible.
      • The ability to unlock all Cluemaster puzzles across Gotham, which then lets you access the Cluemaster puzzle rooms and extra missions.

Common pitfalls and tips

  • Don’t just spam the buttons. You must rotate the dials to the correct icons; mashing the buttons won’t solve it.
  • Look for the reflected numbers. The symbols are 1–4 mirrored; compare them to the clue wall and mentally “unmirror” them to see which number each is.
  • Use Robin. The puzzle is designed for Robin’s staff interaction; other characters may not rotate the dials properly.
  • If you’re stuck:
    • Rotate each dial slowly, pausing on each symbol and checking if it matches the clue order.
    • Many players report that once they realize the shapes are reflected numbers, the sequence becomes obvious: 3‑1‑4‑2.

That’s the full solution: identify the reflected-number symbols, set the four dials to 3, 1, 4, 2 , then press the button. This unlocks the rest of the Cluemaster puzzle content in the game. Information gathered from public forums or data available on the internet and portrayed here.