Lego Batman 2: DC Super Heroes (Wii U)

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Batman: Arkham Asylum reference

When you battle the Prototype LexBot near the end of level 9, the robot runs into the walls and can be hurt just like Bane and the Titan Thugs from Batman: Arkham Asylum.

Batman: Arkham City reference

During the introduction for level 4, "Arkham Assignment", Vicki Vale refers to a failure to have the inmates locked up in a walled off area of Gotham City by the mayor. Select level 4, "Asylum Assignment", and listen when Vicki Vale says "Hey, at least the mayor's plan to let them loose in some vast, walled off area in the heart of the city got put on hold. Now, that would've never have ended well" in the news report.

Cheat Codes

Pause game play, select the "Extras" option, then "Enter Code". Then, enter one of the following codes to activate the corresponding cheat function.

EffectCode
Characters 
Alfred PennyworthZAQ637
BatgirlJKR331
Bruce WayneBDJ327
Catwoman (classic)M1AAWW
Clown Goon9ZZZBP or HJK327
Commissioner GordonDDP967
FishmongerHGY748
Freeze GirlXVK541
Freeze HenchmanNJL412
Joker GoonUTF782
Joker HenchmanYUN924
LexbotW49CSJ
Mad HatterJCA283
Man-BatNYU942
Military PolicemanMKL382
Mime GoonZQA8MK
NightwingMVY759
Penguin GoonNKA238
Penguin HenchmanBJH782
Penguin MinionKJP748
Poison Ivy GoonGTB899
Police MarksmanHKG984
Police OfficerJRY983 or V9SAGT
Riddler GoonQ285LK
Riddler HenchmanXEU824
S.W.A.T.HTF114
SailorNAV592
ScientistJFL786
Security GuardPLB946
The Joker (tropical)CCB199
Two-Face Goon95KPYJ
YetiNJL412
Vehicles 
Bat-TankKNTT4B
Bruce Wayne's Private JetLEA664
Catwoman's MotorcycleHPL826
Garbage TruckDUS483
Goon HelicopterGCH328
Harbor HelicopterCHP735
Harley Quinn's Hammer TruckRDT637
Harley Quinn's MotorbikeC79LVH
Mad Hatter's GliderHS000W
Mad Hatter's SteamboatM4DM4N
Mr. Freeze's IcebergICYICE
Mr. Freeze's KartBCT229
Penguin Goon SubmarineBTN248
Police BikeLJP234
Police BoatPLC999
Police CarKJL832
Police HelicopterCWR732
Police VanMAC788
Police WatercraftVJD328
Riddler's JetHAHAHA
Robin's SubmarineTTF453
The Joker's VanJUK657
Two-Face's Armored TruckEFE933
Zoo SweeperDWR243
Game play 
Beep BeepZHAXFH
Character StudsTPJ37T
DisguisesBWQ2MS
Extra Hearts4LGJ7T
Extra Toggle7TXH5K
Fall RescueTPGPG2
Gold Brick FinderMBXW7V
Minikit FinderLRJAG8
Peril FinderRYD3SJ
Red Brick Finder5KKQ6G
Regenerate HeartsZXEX5D
Stud MagnetMNZER6
Studs X274EZUT
Super BuildJN2J6V
Vine GrapplesJXN7FJ

Red Brick Minikit finder

This costs 50,000 studs to purchase. In Gotham Park near the park, play the mini game with the boats. Shoots the subs with your boat.

Red Brick X2

Locate the Remote Bat Computer near the police station. Turn left and you will see a mini-game. Play the game and smash the cars with your hammer car to receive the red brick x2.

Superman theme music

When you fly as Superman outside of a level, the theme from the Superman movie will play.