Enter one of the following codes at the "Cheats" section of the "Specials" 
option at the main menu to activate the cheat function:

Result                        Code  
----------------------------------
Unlock everything           - LEANEST 
God mode                    - ADMNTIUM 
Infinite webbing            - GLANDS 
Full health                 - WEAKNESS 
What If? mode               - UATUSEES 
Character viewer            - RGSGLLRY 
View FMV sequences          - CINEMA 
All comic books             - FANBOY 
All levels                  - MME WEB 
All comic book covers       - KIRBYFAN 
Storyboard Viewer           - ROBRTSON 
Cartoon Spider-Man          - FUNKYTWN 
Stickman Spider-Man         - STICKMAN 
Quick Change Spidey costume - SM LVIII 
Ben Reilly costume          - CLUBNOIR 
Peter Parker costume        - MRWATSON 
Amazing Bag Man costume     - KICK ME 
Scarlet Spider costume      - XILRTRNS 
Spidey Unlimited costume    - SYNOPTIC 
Captain Universe costume    - TRISNTNL 
Spidey 2099 costume         - MIGUELOH 
Symbiote Spidey costume     - SECRTWAR 
J. James Jewett             - RULUR 
Pulsating head              - EGOTRIP