What to know
- The Subwayne unlock in Cauldron North is tied to the Restore Power to the Billboard objective.
- You must activate four separate power switches connected through blue electrical wires.
- Your AI companion is required to extinguish the fire blocking the first power source.
- Completing the billboard puzzle unlocks the Subwayne access point in Cauldron North Ace Chemicals.
After progressing through the Criminal Chemistry mission in LEGO Batman: Legacy of the Dark Knight, you will eventually reach the objective to restore power to the Ace Chemicals billboard. This puzzle acts as the final requirement for unlocking the Subwayne station in Cauldron North. The challenge mainly involves tracking blue power cables across the building while activating multiple switches placed at different elevations.
LEGO Batman billboard power puzzle details
| Objective | Location | Requirement |
|---|---|---|
| Talk to construction workers | Cauldron North Ace Chemicals | Starts the power restoration task |
| Extinguish fire near power source | Behind the building | AI companion interaction |
| Activate first switch | Rear lower section | Manual button press |
| Activate second switch | Ground floor interior side | Follow blue wires |
| Activate third switch | Front building facade | Use boomerang |
| Activate fourth switch | Rooftop ledge near billboard | Grapple upward |
| Unlock Subwayne | Construction area | Speak to worker again |
The entire puzzle revolves around restoring electricity to the large illuminated billboard connected to the Subwayne construction system. Every switch you activate powers another section of the circuit. The game visually guides you using glowing blue wires, making it easier to identify where the next objective is located.
The puzzle also introduces light traversal mechanics, including grappling, boomerang targeting, and environmental interactions involving your AI teammate.
How to restore power to the billboard in Subwayne Cauldron North
After speaking with the construction workers, head toward the back side of the Ace Chemicals building. You will notice an area covered in flames blocking access to the main power source.
This section can easily be missed because the power unit is partially hidden behind industrial pipes and debris.
Step 1
Head behind the Ace Chemicals building after receiving the objective from the construction workers.
You will find a burning electrical area. Wait for your AI companion to extinguish the flames automatically.
Once the fire is cleared, interact with the first switch to begin restoring power.
Step 2
After activating the first switch, look for the glowing blue wires extending from the power box.
Follow them toward the ground-floor section of the building to locate the second switch. Press the button to continue the power flow.
Step 3
The next power node is attached to the front facade of the building and cannot be reached directly.
Equip your boomerang gadget and throw it at the highlighted switch target. Once hit successfully, the third section powers on.
This step is important because many players initially try climbing the wall instead of using ranged gadgets.
Step 4
Now grapple upward toward the rooftop ledges above the billboard area.
Continue climbing until you reach the final power switch positioned beside the billboard structure.
Activate the fourth button to fully restore electricity to the sign. Once powered, the billboard lights up immediately, confirming successful completion of the puzzle.
What happens after restoring power
As soon as all four switches are active, the Ace Chemicals billboard becomes illuminated, signaling that the electrical network has been restored successfully.
Return to the nearby construction worker and interact with them again. This completes the Subwayne unlock objective in Cauldron North and grants access to the new fast-travel station.
Rewards and unlocks
| Reward | Description |
|---|---|
| Subwayne Access | Unlocks fast travel in Cauldron North |
| Mission Progression | Advances Criminal Chemistry mission |
| Exploration Access | Easier movement across Gotham |
| Stud Opportunities | Additional traversal routes become available |
Restoring Subwayne in Gotham City
Unlocking Subwayne stations early significantly improves navigation throughout Gotham City. The Cauldron North station becomes especially useful during later investigation and chase missions connected to Ace Chemicals and surrounding industrial districts.
Because LEGO Batman 2026 features a larger open-world structure compared to previous entries, fast travel systems save a substantial amount of traversal time.
The Restore Power to the Billboard sequence is one of the earlier environmental puzzles that combines several gameplay mechanics together. By following the blue wiring system carefully and using the correct gadgets at each stage, you can restore the Ace Chemicals billboard quickly and unlock the Cauldron North Subwayne without unnecessary backtracking.
