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Mission 9: Joker 100% – LEGO Batman Legacy Walkthrough

Looking for a 100% guide to Mission 9: Joker in LEGO Batman: Legacy of the Dark Knight? This walkthrough covers every step of The Big Dukeroo – from releasing all three parade balloons to locating every hidden collectible along the way. You’ll find all 5 Cakes, all 5 WayneTech Caches, the Red Brick: Showbiz, and the Skill Brick reward, all in order, so you won’t miss a thing.

Related Guides:
Mission 8: Flugelheim
Mission 10: Two-Face
LEGO Batman: Legacy of the Dark Knight Hub


Apart from the yellow Skill Brick at the end of the mission, you can also find:

How to Replay a Mission

In case you didn’t find all collectibles in the first story playthrough, don’t worry. You can still get it. Play the story to Mission 6: Shreck’s Department Store, where you restore the Batcave.

Then, travel to the Batcave and interact with the computer at the top, next to the red batphone. Here you can select the mission you would like to play again.

How to Replay a Mission Computer - Lego Batman Legacy of the Dark Knight camzillasmom.com
How to Replay a Mission Computer List - Lego Batman Legacy of the Dark Knight camzillasmom.com

You will also see the status. If the box is ticked: Congratulations, you’ve found all the collectibles in this mission. If not, there is still work to be done!

Batcave Trophy: Cakes

Find and destroy 5 Cakes in Mission 9: Joker to receive the Batcave Trophy: Cakes. Each adds up to the total of 170 Trophy Collectibles. Therefore, you will have 5 of 170 Trophy Collectibles after destroying all five Cakes.

Here’s where they are:

Red Brick: Showbiz

In Mission 9: Joker, the Red Brick is inside an apartment. Between Balloon 2 and 3, look up to find the apartment window that you can cut open. Inside, move the TV so Kitty can reach the Kitty Vent to get the Red Brick on the other side.

Redbrick Window - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

Wayne Tech Caches

Find and open 5 Wayne Tech Caches in Mission 9: Joker to receive a total of five WayneTech Chips.

Here’s where they are:

Go to the Parade

The parade is in the Old Gotham North district. Head to the mission marker to continue.

Go to the Parade map - Party Prep - Mission 9 - Lego Batman Legacy of the Dark Knight camzillasmom.com
Go to the Parade - Party Prep - Mission 9 - Lego Batman Legacy of the Dark Knight camzillasmom.com

Starting the mission at the mission marker on the roof will start Mission 9: Joker.

Release the Balloons

There are three balloons you have to release now. Each of them have their own numbered mission marker.

First Balloon

It is right at the mission start location. The balloons are attached to a tall rectangular anchor point. First, use Catwoman’s Whip on the yellow screw, then switch to Batman to use the Bat Claw on the yellow grapple plug.

Release Ballon 1 Whip - The Big Dukeroo - Mission 9 - Lego Batman Legacy of the Dark Knight camzillasmom.com
Release Ballon 1 Bat Claw - The Big Dukeroo - Mission 9 - Lego Batman Legacy of the Dark Knight camzillasmom.com

While Batman is pulling on the plug, switch to Catwoman and go to the front of the rectangular anchor. There is a Kitty vent. Summon a kitty, get inside, and pick up the control handle. Take it back to Catwoman.

Release Ballon 1 Kitty Vent - The Big Dukeroo - Mission 9 - Lego Batman Legacy of the Dark Knight camzillasmom.com
Release Ballon 1 Kitty Vent Crank - The Big Dukeroo - Mission 9 - Lego Batman Legacy of the Dark Knight camzillasmom.com

Now, while Batman is still pulling the plug, Catwoman can climb up the side of the rectangular anchor point and release the balloon using the control handle.

Release Ballon 1 Climb Wall - The Big Dukeroo - Mission 9 - Lego Batman Legacy of the Dark Knight camzillasmom.com
Release Ballon 1 Climb Use Control Handle - The Big Dukeroo - Mission 9 - Lego Batman Legacy of the Dark Knight camzillasmom.com

Batcave Trophy: Destroy 5 Cakes

Every Cake counts as 1 of 170 trophy collectibles.

The first cake is hidden behind the baker’s van, right next to the first balloon.

Release Ballon 1 Cake 1 of 5 - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

WayneTech Cache 1 of 5

Next to balloon 1 is an alley with a climbable wall and a lever at the top (look for the line of golden studs). Switch to Catwoman to climb the wall and pull the lever. This will open the restaurant below with the WayneTech Cache visible inside the locked kitchen.

WayneTech Cache 1of 5 Wall - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com
WayneTech Cache 1of 5 Kitchen - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

As Catwoman, summon a kitty and send it through the Kitty Vent to open the door from the other side. You can now open the WayneTech Cache.

WayneTech Cache 1of 5 Kitty - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com
WayneTech Cache 1of 5 Kitty Lever - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

Cakes 2 of 5

The second cake is between balloons 1 and 2 on the left side, on top of a window cleaning platform.

Cakes 2 of 5 - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

WayneTech Cache 2 of 5

While taking care of the previous Cakes collectible, you might hear a Delivery Guy complaining about losing his WayneTech deliveries. Just below the previous Cake, there is a golden stud line and the Delivery Guy sitting there. Use UV Vision where he sits.

WayneTech Cache 2 Delivery Guy - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com
WayneTech Cache 2 UV Vision - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

Follow the footprints into the alley, where you can move a palette to the right. This will open up the passage to the shed behind it, where the WayneTech Cache is.

WayneTech Cache 2 UV Light Alley - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com
WayneTech Cache 2 UV Light Palette - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

Second Balloon

You will notice the pillars with Joker’s face on them. Switch to Catwoman and use the Whip to turn each element so all three faces are looking forward. This will collapse the pillar into a shorter one.

Release Ballon 2 Start - The Big Dukeroo - Mission 9 - Lego Batman Legacy of the Dark Knight camzillasmom.com
Release Ballon 2 Collapsed Pillar - The Big Dukeroo - Mission 9 - Lego Batman Legacy of the Dark Knight camzillasmom.com

Do this with both pillars, and the center door will open, releasing two explosive Jack-in-the-Boxes. Enter the room to find the handle for the release mechanism at the top.

Release Ballon 2 Door Open - The Big Dukeroo - Mission 9 - Lego Batman Legacy of the Dark Knight camzillasmom.com
Release Ballon 2 Door Open Handle Inside - The Big Dukeroo - Mission 9 - Lego Batman Legacy of the Dark Knight camzillasmom.com

Grapple to the top, place the handle, and release the balloon.

Release Ballon 2 Grapple Up - The Big Dukeroo - Mission 9 - Lego Batman Legacy of the Dark Knight camzillasmom.com
Release Ballon 2 Grapple Up Release - The Big Dukeroo - Mission 9 - Lego Batman Legacy of the Dark Knight camzillasmom.com

Cakes 3 of 5 & Purple Stud

There is a food stall on the right, next to the second balloon. It has the Cake inside of it. There is a purple stud behind the food stall.

Second Balloon Cake Food Stall - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

Cakes 4 of 5

The fourth Cake is hiding behind the second balloon anchor point, the volcano/rock.

Second Balloon - Cake 5 - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

WayneTech Cache 3 of 5

High up on the building to the left of the second balloon is a grapple bar lined with golden studs. Grapple up there and cut the glass with Catwoman to enter the apartment with the WayneTech Cache.

Second Balloon WayneTech Cache 3 grapple - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com
Second Balloon WayneTech Cache 3 Cut Glass - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

Cakes 5 of 5

The fourth Cake is in the alley below the previous WayneTech apartment. The golden studs are a giveaway.

Second Balloon Cake 4 of 5 - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

Red Brick: Showbiz

Between the second and the third balloon. Look high up there is a shimmering window. Grapple up to one of the vantage points next to the window and balance on the rope to reach the window. Cut the glass with Catwoman.

Redbrick Window - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com
Redbrick Window Cut Glass - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

Jump inside and move the TV a bit to the left. Not all the way. Then, summon the Kitty. Start on top of the coffee table, then jump onto the TV. From there onto the bookshelf to reach the Kitty Vent. You may have to adjust the TV’s position to reach the top of the bookshelf.

The Red Brick is on the other side of the Kitty Vent in the locked room. Jump up on the coffee table to get it. For Fun: There is an item in this room that Kitty can interact with!

Redbrick Kitty Path - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com
Redbrick location - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

Third Balloon

Go to the last balloon. After fighting the thugs, look for the spot where Batman can use X-Ray Vision. You will see how the machine is built. Follow it to the left side, where you will discover a wall where Batman can use the Explosive Spray.

Third Balloon XRay Vision - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com
Third Balloon Wall - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

Destroy the wall, and use Catwoman’s Whip to lower the gate. Inside is a safe she can crack.

Third Balloon Lower Gate - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com
Third Balloon Crack Safe - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

Inside the safe is the handle for the balloon release mechanism. As soon as the safe is open, some more henchmen will attack. After the fight, climb the two side walls to reach the top and release the third balloon using the handle.

Third Balloon First Wall - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com
Third Balloon Second Wall - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

WayneTech Cache 4 of 5

WayneTech Cache 4 is next to balloon 3, inside a van. Use Batman’s Bat Claw to pull the van open and release the WayneTech Cache.

Third Balloon - WayneTech Chace 4 - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com
Third Balloon - WayneTech Chache 4 out - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

WayneTech Cache 5 of 5

To the left of the third balloon is a shop whose window can be cut open by Catwoman.

Third Balloon WayneTech Cache 5 of 5 shop - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com
Third Balloon WayneTech Cache 5 of 5 glass - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

Inside are three surveillance cameras. Shoot them with the Batarang and head to the back kitchen to find the last WayneTech Cache.

Third Balloon WayneTech Cache 5 of 5 location - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

For Fun: Swipe the Money!

You can swipe all the piles of money lying around for studs!

Swipe Money - The Big Dukeroo - Mission 9 - Lego Batman Legacy of the Dark Knight camzillasmom.com

Find a Way to Reach Joker

Fight Joker’s thugs, then build a pump. Jump on it to inflate the Bat Balloon. Avoid Joker’s rockets and enjoy the mission’s ending.

Find a Way to Reach Joker Build - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com
Find a Way to Reach Joker Foot Pump - The Big Dukeroo - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com

Completing Mission 9: Joker, grants:
-> 1 Skill Brick (Yellow Brick)

Suits Collectibles:
-> 1x Batman (Batman: The Brave and the Bold)
-> 1x Catwoman (Nine Lives)

Additional Collectibles:
-> Batcave Trophy: Cakes
-> Red Brick: Showbiz
-> 5x Wayne Tech Caches

Collectibles - Mission 9 Joker - Lego Batman Legacy of the Dark Knight camzillasmom.com
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About LEGO Batman: Legacy of the Dark Knight

Release: May 22nd, 2026
Developer: TT Games
Publisher: Warner Bros. Games
Official Website: https://legobatmangame.com/