In LEGO Batman 2: DC Super Heroes, Mission 6, titled "Chemical Crisis," requires players to infiltrate Ace Chemicals to stop the Joker and Lex Luthor. To complete the mission, you must use Batman’s Sensor Suit and Robin’s Hazard Suit to track chemical signatures, solve color-mixing puzzles, and navigate toxic environments.
Mission 6 is a pivotal moment in the LEGO Batman 2: DC Super Heroes campaign. It marks the point where the stakes escalate from local Gotham villainy to a high-tech conspiracy involving Lex Luthor’s "Deconstructor" technology. This level is widely regarded by players as one of the more mechanically complex stages due to the introduction of the "chemical signature" puzzles, which require a firm understanding of the Hazard Suit’s interaction with different liquid types.
As of 2026, this title remains a benchmark for LEGO game design, and understanding the specific requirements of Mission 6 is essential for both completionists and those simply trying to progress through the narrative. This guide provides a comprehensive breakdown of the suit mechanics, the step-by-step path through Ace Chemicals, and the specific logic behind the chemical mixing sequences.
Essential Character Suits for Mission 6
Before entering the depths of Ace Chemicals, it is vital to understand the tools at your disposal. Mission 6 relies heavily on suit-swapping mechanics. Unlike earlier missions that might favor combat, "Chemical Crisis" is a puzzle-heavy level that tests your ability to manipulate the environment.
Batman’s Sensor Suit
The Sensor Suit is the primary tool for detecting "chemical signatures." When equipped, Batman gains two critical abilities:
- Invisibility: By pressing the special action button, Batman becomes invisible to security cameras and motion sensors. This is required to bypass the automated turrets and laser grids scattered throughout the factory.
- X-Ray Vision: When standing in front of certain green-glowing panels, Batman can look inside the machinery. This is used to manipulate internal gears and pipes to reroute chemical flows.
Robin’s Hazard Suit
The Hazard Suit is the MVP of Mission 6. Without it, the toxic sludge and deep vats of chemicals would be impassable.
- Liquid Suction: Robin can use the nozzle to suck up water, toxic waste, and specific colored chemicals (red, green, and blue).
- Pressure Spray: Once a liquid is stored, Robin can spray it to clear obstacles, fill containers, or wash away slippery surfaces.
- Hazard Protection: This suit allows Robin to walk through green toxic waste and dive underwater without taking damage or drowning.
Phase 1: Infiltrating the Ace Chemicals Perimeter
The mission begins outside the facility. Your primary goal here is to gain entry by disabling the main security gate. This initial section serves as a refresher for the Power Suit and the Sensor Suit.
First, use Batman’s Power Suit to destroy the silver LEGO objects blocking your path. Once the debris is cleared, you will find the first Suit Swapper. Switch Batman into the Sensor Suit. You will notice a faint trail or "chemical signature" leading toward a security booth. Use Batman’s invisibility to walk past the security camera. If you are detected, the gate will lock, and you will need to step back to reset the sequence.
Inside the security booth, interact with the X-ray panel. You will see a series of pipes. Your goal is to rotate the joints until the power flow reaches the gate mechanism. This is a relatively simple pipe-connection puzzle, but it sets the stage for the more difficult chemical puzzles inside.
Phase 2: The Chemical Mixing Chamber
Once inside Ace Chemicals, the game introduces the core "Chemical Signature" mechanic. You will encounter a large machine with three transparent vats: Red, Green, and Blue. To proceed, you must fill these vats to open the blast doors.
Finding the Colors
The chemicals are not immediately available; you must find the sources for each "signature":
- The Blue Chemical: Usually found by using Robin’s Hazard Suit to dive into a nearby water tank and pulling a lever that releases the blue dye into a collection point.
- The Red Chemical: Located behind a series of heat-venting pipes. Batman must use the Sensor Suit to navigate a platforming section and deactivate the steam, allowing Robin to reach the red chemical source.
- The Green Chemical: This is typically found in the main vats or by cleaning up toxic spills using Robin’s suction ability.
Solving the Mixing Puzzle
The game will ask for specific "signatures." This often involves mixing the primary colors you have collected. For example, if the door requires a purple signature, you must fill Robin's tank with Blue, deposit it into the mixing vat, and then go collect Red.
| Chemical Color Needed | Required Mixture | Primary Suit Used |
|---|---|---|
| Purple | Red + Blue | Hazard Suit (Robin) |
| Orange | Red + Yellow/Green | Hazard Suit (Robin) |
| Cyan | Blue + Green | Hazard Suit (Robin) |
| Clear/Water | Pure Water | Hazard Suit (Robin) |
Once the vats are filled with the correct ratios, the "chemical signature" is verified by the computer system, and the next area of the factory unlocks.
Phase 3: Navigating the Toxic Vats and the Deconstructor
After the mixing chamber, the level opens up into a large industrial area filled with vat platforms. This is where many players get stuck because the path forward isn't always linear.
The Joker and Lex Luthor are visible in the background, using the "L-Deconstructor" (a weapon that breaks apart black "indestructible" LEGO bricks). You cannot engage them directly yet. Instead, you must use Robin’s Hazard Suit to walk through the toxic sludge on the floor to reach a series of valves.
The Elevator Puzzle
To reach the upper levels, you must activate a large lift. This requires two things:
- Powering the Lift: Batman must use the Sensor Suit to reach a high platform and interact with an X-ray wall to align the gears.
- Weight Distribution: Robin must fill his Hazard Suit with water and spray it into a collection bucket on the opposite side of the lift to act as a counterweight.
Once the lift is active, you will move toward the final confrontation of the level. This section involves a chase across moving conveyor belts. Watch the floor for the "Deconstructor" beams; Lex Luthor will fire at you, turning the floor into hazardous debris.
Mission 6 Collectibles: Mini-kit Locations
For those aiming for 100% completion in 2026, Mission 6 contains 10 Mini-kits and one "Citizen in Peril." Note that many of these can only be obtained in Free Play mode using characters like Superman, Aquaman, or The Flash.
- Mini-kit 1 (Story Mode): In the first area, use Robin to suck up the green chemicals from three different small spills.
- Mini-kit 2 (Story Mode): Behind the silver pipes near the entrance (requires Batman's Power Suit).
- Mini-kit 3 (Free Play): Use a flying character to reach the high catwalks in the mixing chamber.
- Mini-kit 4 (Free Play): Use a character with Heat Vision (like Superman) to melt a gold LEGO box near the second Suit Swapper.
- Mini-kit 5 (Story Mode): During the conveyor belt sequence, jump onto the small platforms moving in the background.
- Mini-kit 6 (Free Play): Use Aquaman to spray water into a specific tank located in the final boss room.
- Mini-kit 7 (Free Play): Use The Flash to rebuild a broken LEGO object near the X-ray wall.
- Mini-kit 8 (Free Play): Use Cyborg to pull a magnetic blue handle in the toxic vat area.
- Mini-kit 9 (Story Mode): Destroy five Joker-themed posters scattered throughout the factory.
- Mini-kit 10 (Story Mode): Complete the final "chemical signature" mixing puzzle in under 60 seconds (requires fast movement between the vats).
Citizen in Peril: In the room with the three colored vats, look to the far right. A scientist is trapped inside a glass tube. Use Batman’s Power Suit to destroy the silver base of the tube to save him.
Troubleshooting Common Issues in "Chemical Crisis"
The "Stuck Robin" Glitch
Sometimes, when Robin is using the Hazard Suit to suck up chemicals, the animation may loop, and the tank won't fill. If this happens, jump to cancel the animation and ensure you are standing directly over the "bubbling" part of the liquid.
X-Ray Wall Not Responding
If Batman’s X-ray vision doesn't trigger the gear puzzle, ensure you have defeated all nearby LexBots. The game occasionally locks interactive objects until the immediate combat zone is cleared.
Missing the "Chemical Signature"
If the door isn't opening after you've filled the vats, check the floor. There are often small trails of colored light. These are the "signatures." If the trail is purple, and your vat is green, you must use the "empty" function on Robin's Hazard Suit (usually by spraying it into a drain) and start the mixture over.
Summary of Mission Objectives
To ensure you haven't missed a step, follow this checklist:
- Enter Ace Chemicals using the Power Suit and Sensor Suit.
- Obtain the Hazard Suit for Robin.
- Clear the toxic spill to access the internal factory.
- Complete the Red/Green/Blue chemical mixing puzzle.
- Use the counterweight lift to reach the upper catwalks.
- Survive the Deconstructor beam chase on the conveyor belts.
- Reach the final cutscene where Superman arrives to assist.
Frequently Asked Questions
Which character is best for the chemical signature mission?
In Story Mode, you are locked to Batman and Robin. However, Robin is the most important character for this specific mission because the Hazard Suit is required for the primary puzzles. In Free Play, characters like Superman or Aquaman make the level much easier by bypassing the need for specific suit-swappers.
How do I mix the colors in the Hazard Suit?
Robin’s Hazard Suit can hold one color at a time. To mix colors, you must spray the first color into the large vat on the wall, then go find the second color and spray that into the same vat. The machine will then combine them automatically to create the required signature.
Why is Batman's Sensor Suit not working on the cameras?
You must manually activate the invisibility. On most controllers, this is the "Circle" or "B" button. If you just walk in front of a camera without the "shimmer" effect around Batman, the alarm will sound and the path will be blocked.
Can I skip the chemical mixing part?
No, the chemical mixing sequence is a "gate" puzzle. The exit door to the next section of the level will not trigger its opening animation until the game detects the correct color values in the vats.
Where is the Hazard Suit swapper?
The Hazard Suit swapper is located shortly after you enter the building, right after the first toxic waste pool that Batman cannot cross. It is on a raised platform to the left.
Practical Recommendations for Players
When playing Mission 6, focus on clearing the "trash mobs" (the LexBots) before attempting the puzzles. The combat in this level is frequent, and getting hit while in the X-ray vision mode or while spraying chemicals will reset your progress on that specific interaction. Furthermore, if you are playing in co-op, have one player stay as Batman in the Sensor Suit to manage the cameras while the other handles the chemical mixing as Robin. This division of labor significantly speeds up the mission.
