Indiana Jones And The Infernal Machine cheats and cheat codes for Nintendo 64

Go to the Passcodes screen in the Options menu and type in
the following passwords:

Audio showroom: Enter "MUCKE"
Concept arts: Enter "ANCIENT"
Credits: Enter "ABSPANN"
Enable expert mode: Enter "REALHARD"
Select any stage: Enter "FORGEOFF"
View dev-team: Enter "CHEESE!!"

Secret stage in Peru:
Reach 1500 I.Q. points