Injustice: Gods Among Us Cheats for Wii U

Enter the Fortress of Solitude Arena with two characters playing Doomsday but with different costumes on (Insurgency costume and the regular costume). When you do this the Doomsday on display in the back of the level will wear the outfit from Death of Superman.

Check out the video below to see ALL the endings in the game.
Watch the video

Several non-playable DC Universe characters make an appearance in the game. These characters are listed below.
Abin Sur (Green Lanter victory pose)
Athena (Themyscira stage)
Atom Smasher (Hall Of Justice stage)
Atrocitus (Metropolis stage)
Ch'p (Green Lanter victory pose)
Darkseid (Hall Of Justice stage)
Deadshot (Stryker's Island stage)
Giganta (Hall Of Justice stage)
Gorilla Grodd (Stryker's Island stage)
Guy Gardner (Green Lanter victory pose)
Hammeroon (Green Lanter victory pose)
Hugo Strange (Arkham Asylum stage)
John Stewart (Green Lanter victory pose)
Katma Tui (Green Lanter victory pose)
Killer Croc (Arkham Asylum stage)
Kilowog (Metropolis stage)
Martian Manhunter (Watchtower stage)
Metallo (Stryker's Island stage)
Parasite (Stryker's Island stage)
Penguin (Arkham Asylum stage)
Salaak (Green Lanter victory pose)
Scarecrow (Arkham Asylum stage)
Starro (Fortress Of Solitude stage)
Stel (Green Lanter victory pose)
The Atom (Hall Of Justice stage)
The Riddler (Arkham Asylum stage)
Tomar Re (Green Lanter victory pose)
Trigon (S.T.A.R. Labs opponent)
Two-Face (Arkham Asylum stage)

The video below will help you progress if you are struggling with the game.
Watch the video

When you complete the following tasks the corresponding alternate costume will become unlocked.
Aquaman
Regime:
Purchase with Armory Key in the Archives (A1).

Flashpoint:
Available with Season Pass.

Ares
Regime:
Purchase with Armory Key in the Archives.

Bane
Regime:
Purchase with Armory Key in the Archives (A3).

Knightfall:
Rate the Injustice Mobile iOS app.

Batman
Insurgency:
Purchase with Armory Key in the Archives (A4).
New 52:
Special Edition exclusive.

Blackest Night:
Best Buy pre-order exclusive.
Arkham City:
Walmart pre-order exclusive.

Batman Beyond:
Get any Batman character card in the Injustice Mobile iOS app.

Black Adam
Regime: Purchase with Armory Key in the Archives (a5).

Catwoman
Regime:
Purchase with Armory Key in the Archives (A6).

Arkham City:
Walmart pre-order exclusive.

Cyborg
Regime:
Purchase with Armory Key in the Archives (B1).

Deathstroke

Insurgency:
Purchase with Armory Key in the Archives (B2).

Flashpoint:
Available with Season Pass.

Doomsday
Regime:
Purchase with Armory Key in the Archives (B3).

The Flash
Regime:
Purchase with Armory Key in the Archives (B4).
New 52:
Complete Speed Run Battle Tournament mode; alternately, link a WBID account.
Elseworld's Finest:
Earn 3 Stars in ALL S.T.A.R. Labs missions.

Green Arrow
Insurgency:
Purchase with Armory Key in the Archives (B5).
Arrow:
Play through Battle Arena.

Green Lantern
Regime:
Purchase with Armory Key in the Archives (b6).
New 52:
Complete a bonus battle in the Injustice Mobile iOS app.
Yellow Lantern:
Win an online ranked match.

Harley Quinn
Insurgency:
Purchase with Armory Key in the Archives (C1).
Arkham:
Get any Joker character card in the Injustice Mobile iOS app.

Hawkgirl
Regime:
Purchase with Armory Key in the Archives (C2).
The Joker
Insurgency:
Purchase with Armory Key in the Archives (C3).
Arkham City:
Walmart pre-order exclusive.

Killer Frost
Regime:
Purchase with Armory Key in the Archives (C4).

Lex Luthor
Insurgency:
Purchase with Armory Key in the Archives (C5).
Kryptonite:
Complete ALL S.T.A.R. Labs missions.

Nightwing
Regime:
Purchase with Armory Key in the Archives (C6).
New 52:
Reach level 30.

Raven
Regime: Purchase with Armory Key in the Archives (D1).

Shazam

Regime:
Purchase with Armory Key in the Archives (D2).
New 52:
Complete ALL S.T.A.R. Labs Shazam missions.

Sinestro

Regime:
Purchase with Armory Key in the Archives (D3).
Blue Lantern:
Unknown.

Solomon Grundy
Regime:
Purchase with Armory Key in the Archives (D4).

Boss Grundy:
Complete Classic Battle mode.
Red Son: Gamestop pre-order exclusive.

Superman
Regime: Purchase with Armory Key in the Archives (D5).
Red Son:
Gamestop pre-order exclusive.
New 52:
Special Edition exclusive.
Godfall:

The following bonuses in the linked console version of the game will become unlocked when you complete the corresponding task in the Injustice Mobile iOS app.
Batman Beyond:
Obtain any Batman character card.
New 52 Green Lantern:
Complete a Bonus Battle in Injustice Mobile.
Knightfall Bane:
Rate Us!
Arkham Harley:
Obtain any Joker character card.
Bane Background:
Collect 5 character cards in Injustice Mobile.
Solomon Grundy Background:
Collect 10 character cards.
Superman's Cape Background:
Collect 15 character cards.
Bars of Gold Background:
Collect 30 character cards.
Killer Frost Background:
Evolve a character card to max.
Wonder Woman Icon:
Complete a battle in Injustice Mobile.
Green Arrow Icon:
Complete 10 battles in Injustice Mobile.
The Joker Icon:
Complete 25 battles in Injustice Mobile.
Doomsday Icon:
Complete 40 battles in Injustice Mobile.
Superman Icon:
Complete the Tutorial.
Wonder Woman Portrait:
Login once to Injustice Mobile.
Green Arrow Portrait:
Login 5 times (counts once per day).
The Joker Portrait:
Login 10 times (counts once per day).
Doomsday Portrait:
Login 20 times (counts once per day).
Superman Portrait:
Login 30 times (counts once per day).
Hidden Reward:
Complete ALL Battles in Injustice Mobile.