Play as Green Goblin:
Start the game on hard or super hero difficulty and get into the first level. Use the 
pause menu and quit out to the main shell. Enter the "ARACHNID" cheat in the 
cheats menu which will open up all levels. Use "Level Warp" to go to the conclusion 
level. This is only the final cinematic where Norman reveals himself to Spidey and 
is taken out by the glider. When you play this cinematic you have essentially 
beaten the game on whatever difficulty you chose at the beginning. Get back to 
the main menu and enter the "Secret Store". Turn on the Green Goblin. Use "Level 
Warp" or just start a new game and you will be playing as the Green Goblin. You 
will be playing at whatever difficulty you chose at step one unless you choose to 
start a new game and select a new difficulty.

Bosses Solution:
Here are solutions to the first three bosses: 

Shocker: Dodge Shockers shock blasts while shooting impact webs with camers 
lock. Shocker will spin around in a shockwave tornado. When he stops he is dizzy 
and can't attack. Put on web gloves and use a combo on him. 

Vulture: Use cannonball kicks when vulture isn't facing you or you can be cool and 
ride on Vulture's shoulders and punch his head. When Vulture lands use powerful 
combos like uppercut with web gloves. 

Scorpion: This is one of the hardest enemies. Immediatly put on advanced web 
gloves. Avoid Scorpion while landing a few hits. When Scorpion climbs up the walls 
web-yank him and attack him with tackle a few times.

First Person View:
In Specials, enter: UNDERTHEMASK

Play as a Scientist:
In Specials, enter: SERUM

Play as a Police Officer:
In Specials, enter: REALHERO

Play as Captain Stacey:
In Specials, enter: CAPTAINSTACEY

Play as Thug Model 1:
In Specials, enter: KNUCKLES

Play as Thug Model 2:
In Specials, enter: STICKYRICE

Play as Thug Model 3:
In Specials, enter: THUGRUS

Matrix-Style Attacks:
In Specials, enter: DODGETHIS

Small Spider-Man:
In Specials, enter: SPIDERBYTE

Enemies Have Big Heads:
In Specials, enter: JOELSPEANUTS

Play as The Shocker:
In Specials, enter: HERMANSCHULTZ

Super Coolant:
In Specials, enter: CHILLOUT

Goblin-Style Costume:
In Specials, enter: FREAKOUT

Infinite Webbing:
In Specials, enter: ORGANICWEBBING

All Fighting Controls:
In Specials, enter: KOALA

Play as Mary Jane:
In Specials, enter: GIRLNEXTDOOR

Big Head and Feet:
In Specials, enter: GOESTOYOURHEAD

Level Select:
In Specials, enter: IMIARMAS

Bonus Training Levels:
In Specials, enter: HEADEXPLODY

Level Skip:
In Specials, enter: ROMITAS

All Regular Levels, FMVs, Gallery:
In Specials, enter: ARACHNID