Mayhem Runs are the core loop of the Mayhem Collection for LEGO Batman: Legacy of the Dark Knight. You launch them from a planning table inside Joker and Harley Quinn’s Funhouse hideout on Amusement Mile, drop into a locked-down slice of Gotham, wreck as much of it as possible, and try to disappear before the timer runs out. How you leave decides how much of the loot you actually keep.
Quick answer: Reach an Extraction Sewer before the Mayhem Timer hits zero. A clean escape keeps every stud and adds a +10% bonus; getting caught by Batman applies a 50% Captured penalty.
How a Mayhem Run ends: Extraction vs. capture
Every run is timed. The Mayhem Timer counts down toward the moment Batman and Robin show up, and collecting studs feeds the meter to buy you more seconds. Objectives such as graffiti, roadblocks, and vehicle destruction also top it up, which is why a run that keeps moving lasts far longer than one spent smashing a single street’s worth of props.
When the timer expires, Batman and Robin take you back in a cutscene, and the post-run A.R.G.U.S. report cuts your payout in half. The introductory run is rigged that way on purpose — no extraction points are available on it, so the capture is scripted and unavoidable. From the second run onward, escaping is entirely on you.
| Run | Outcome | Modifier | Payout |
|---|---|---|---|
| First (tutorial) | Timer expired, captured | Captured -50% | 5,312 studs |
| Second | Sewer extraction, 7s left | Clean Escape +10% | 41,271 studs |
The report itemizes what you did — cash registers smashed, graffiti sprayed, vehicles stolen, roadblocks cleared — then applies the modifier at the bottom. That closing line is your confirmation: “Clean Escape” with a positive percentage means the studs banked in full.
Finding and using an Extraction Sewer
Extraction points are manholes marked by a green icon on the map and a column of green smoke in the world. The game explains the rule mid-run, but by then the clock is already short, so it pays to locate one early rather than hunting for it in the final thirty seconds.
Use a different exit each time you run. There is an achievement for using every extraction point, and rotating them also teaches you where the exits sit relative to the richest objective clusters.
What to hit during a run to extend the timer
The district map has a toggle list for every category of target, and turning off the clutter makes planning much faster. These are the icons you can filter:
- A.R.G.U.S. Roadblocks — armored enforcers with hammers, high stud value
- Pop Up Shops — temporary run power-ups, including vehicle keys
- Store Heists and Safes — scripted robbery objectives
- Graffiti — spray a marked wall for studs and extra time
- ATMs — quick stud pickups on the street
- Landmarks — fixed points of interest across the district
Street scenery, newspaper stands, and cash registers all pay out, but they are filler between real objectives. Summoning your crew to clear waves of rival thugs adds seconds directly to the run, and explosive barrels near the docks clear groups quickly. Pop-up shops sell temporary boosts like Dodge Launch at the start of a run, which is worth taking when you plan to cover a lot of ground.
Setting up the Funhouse hideout
You reach the hideout by sliding down a water tunnel into a run-down theater, which is also how you return after each run with your studs. Joker calls it his corner of society; Harley, more accurately, says it needs work. Expanding it is the prerequisite for most of the systems the runs rely on, and fully expanding it awards the Base of Operations trophy.
Joker and Harley each start with a small set of costumes — Batman: The Animated Series and Dr. Quinzel for Harley, the Arkham Jumpsuit and Clown Prince of Crime for Joker — with 30 more outfits to unlock across the DLC.
Toy Shop
The boarded-up door across the hideout floor opens into the Toy Shop, a neon room holding costume mannequins and Build Zone plates. Build Zones let you delete existing props and place your own — the first prompt asks for three easels — so this is where hideout customization actually happens.
Theater
The Theater is the expensive expansion, gated behind a door that costs 100,000 studs. Inside you get a stage, seating, and more side Build Zones. It is a customization space rather than a functional upgrade, so buy it after you have your permanent equipment sorted.
Planning table
In the room’s center, Joker-Mite makes a cluster of gift-wrapped boxes. Break those boxes, then assemble the multi-tiered tower shaped like a cake. Every Mayhem Run begins at that table, which also lets you reroll objectives before departure.
Joker-Mite: Permanent equipment vs. temporary power-ups
Joker-Mite is trapped inside a cash register in a stack of balloon-decorated crates near the main hideout floor. Smash the crates, smash the register, and he pops out complaining about being stuck since 2010. He then sets up merchant stations in the hideout and pop-up stands out in Gotham.
The split matters. Pop-up stands sell single-run items and cosmetics such as Updraft, The LEGO Batman Movie suit, and the Batman Beyond suit, all of which vanish when the run ends. The hideout station sells permanent equipment that carries into every future run. The Vehicle Key unlocks early and cheap; the Grapple Hook sits at 500,000 studs.
Bank your early payouts toward permanent equipment before spending on temporary boosts. Mobility upgrades shorten the trip to an extraction point, which raises every payout afterward.
Costume stock in the hideout shop refreshes as you progress, adding suits like Caped Crusader for Harley and Batman ’04 for Joker. Buying every piece of equipment from Joker-Mite is its own achievement, so the shop stays relevant long after the first few runs.
Hench Master and building a crew
After your first run, Hench Master comes into the hideout, gets up from the floor, and proposes recruiting and training former Arkham inmates as henchpeople. During a run, you can call those recruits in to attack thugs, break crates, and add seconds. The related achievements require three henchpeople recruited and ten crew members active simultaneously, showing that the feature continues beyond the opening runs.
Task Force X enters after your first clean escape
Escaping Gotham with a full payout does not end the story. Amanda Waller orders Rick Flag to deploy Task Force X, introducing Deadshot, Katana, Captain Boomerang, Mongal, King Shark, Deathstroke, and Polka-Dot Man as the next complication. Batman and Robin were only ever the clock; the Suicide Squad is the escalation.
Once the hideout is expanded, the planning table is built, and you have at least one mobility upgrade banked, the loop settles into a clean rhythm. Pick your objectives, mark the sewer, feed the timer, and leave before the clock does the deciding for you.
