All heroes to level 99:
At the team menu, press up,left,down,up,down
Press Up, Down, Up, Down, Up, Left, Down, Right, Start during game play.
Touch of Death:
Press Left, Right, Down, Down, Right, Left, Start during game play.
Press Up, Left, Up, Right, Down, Right during game play.
Level 30 team:
Press Up, Left, Up, Left, Down, Right, Down, Right, Start at the team menu.
100,000 Gold Coins:
Press Up, Up, Up, Left, Right, Left, Start at the team menu or hero management screen.
Press Up, Up, Down, Down, Left, Left, Left, Start at a save point or the main menu.
Press Left, Right, Left, Right, Up, Down, Up, Down, Left, Right, Start at a save point or the main menu.
Press Up, Down, Up, Down, Left, Right, Left, Right, Up, Down, Start at a save point or the main menu.
Press Up, Right, Left, Down, Up, Right, Left, Down, Start at the simulator terminal screen before you start a comic book mission.
All comic book covers:
Press Left, Right, Right, Left, Up, Up, Right, Start at the Review menu.
All concept art:
Press Down, Down, Down, Right, Right, Left, Down, Start at the Review menu.
Press Up, Left, Left, Up, Right, Right, Up, Start at the Review menu.
Press Up, Down, Right, Left, Up, Up, Down at the Review menu.
At the character select screen, delete all selected characters and press Left, Left, Right, Right, Up, Down, Up, Down, or collect the Daredevil action figures that are scattered throughout the game.
Unlock Silver Surfer:
At the character select screen, delete all selected characters and press Down, Left, Left, Up, Right, Up, Down, Left, or unlock him by completing all Comic missions.
Unlock Black Panther:
Collect the Black Panther action figures scattered throughout the game.
Unlock Dr. Strange:
Rescue him from Mandrin in Act 1.
Rescue him from Mephisto in Act 2.
Play the crane game in Murderworld.
Unlock Nick Fury/Hard Mode:
You can unlock Nick Fury as well as Hard difficulty just by beating the game under easy or normal difficulty.
Unlocking alternate costumes:
For a character's second and third costumes, either gain two to four levels or kill 30, then 175 enemies with them. For each character's fourth costume, complete the Combat Training challenge for them, or get a bronze rank in their comic mission.
|Agents of S.H.I.E.L.D : +5 to all Resistances
||Captain America, Nick Fury, Spider-Woman, Wolverine
|Agile Warriors : 10% Reduced Energy Cost
||Black Panther, Daredevil, Deadpool, Elektra, Spider-Man
|Air Force: +15% Max Health
||Human Torch, Ms. Marvel, Storm and Thor
|Alternate Identities: +5% Criticals
||Ghost Rider (Western), Iron Man (War Machine), Ms. Marvel (Ventura), Spider-Woman (Secret Wars), Thor (Beta Ray Bill)
|Assassins: +60% Credit Drop
||Blade, Deadpool, Elektra, Wolverine
|Avengers : +5% damage
||Captain America, Thor, Iron Man, Spider-Woman, Ms. Marvel
|Bad to the Bone: 5% Damage Inflicted Goes to Health
||Blade, Ghost Rider, Luke Cage, Wolverine
|Bruisers : +15 Striking
||Thing, Captain America, Luke Cage, Ms. Marvel
|Classic Avengers: +5% Damage
||Black Panther, Captain America, Iron Man and Thor
|Dark Past: +5% XP
||Blade, Elektra, Ghost Rider, Spider-Woman
|Defenders : 5% Damage inflicted goes to Health
||Dr.Strange, Iceman, Luke Cage, Silver Surfer
|Double Date: +5 Health Regen
||Black Panther, Invisible Woman, Mr. Fantastic, Storm
|Fantastic Four: +20 Health Per Knockout
||Thing, Invisible Woman, Human Torch and Mr. Fantastic
|Femme Fatale : +5% Damage
||Ms. Marvel, Storm, Invisible Woman, Elektra, Spider-Woman
|Flashback: +15% Max Health
||Captain America (WWII), Daredevil (Original), Ghost Rider (Original), Iceman (Original), IronMan (Classic), Ms. Marvel (Original), Wolverine (Classic)
|Martial Artists: +15 Striking
||Black Panther, Captain America, Daredevil, Nick Fury
|Marvel Knights: +6 Body, Strike, and Focus
||Dr. Strange, Daredevil, Luke Cage, Spiderman, Black Panther
|Marvel Royalty: +60% Credits Dropped
||Black Panther, Dr. Strange, Storm, Thor
|Natural Forces : 5%Dmg inflicted as Health Gain
||Thor, Strom, Human Torch, Ice Man
|Natural Leaders: +5% XP
||Captain America, Dr. Strange, Mr. Fantastic, Nick Fury, Storm
|New Avengers : +5% All Resistances
||Captain America, Luke Cage, Wolverine, Spider-Man, Spider-Woman, Iron Man
|New Fantastic Four : 15% Max Energy
||Ghostrider, Luke Cage, Spider-man, Wolverine
|Power Platoon : 20 Energy per KO
||Silver Surfer, Iron Man, Ms. Marvel, Thor
|Raven Ultimates: +6 Striking, Body, and Focus
||Silver Surfer, Deadpool, Thing, Invisible Woman, Iceman
|Scorchers: +10% Reduced Power Cost
||Ghost Rider Human Torch, Storm, Thor
|Supernatural: +5 Health Regen
||Blade, Dr. Strange, Ghost Rider, Thor
|Think Tanks: +15% to Max Health
||Iron Man, Spider-Man, Mr. Fantastic, Dr. Strange
|Weapon Specialists: +5% Criticals
||Blade, Captain America, Deadpool, Elektra, Nick Fury
Thanks to Revolution Readers david, Darksage812, TheDon, Pelican Felon, david, Darksage812, TinSurfer, Stricka,Mark and hisroyalfredness!