To activate a cheat press [F10] during the game and enter the code at
 the command window:

 taklit_marion on      Invulnerability ON
 taklit_marion off     Invulnerability OFF
 urgon_elsa            All weapons
 azerim_sophia         Health items
 nub_willie            Free hints
 fixme                 Rescue Indy from graphic errors
 makemeapirate         Indy turns into Guybrush Threepwood AN/AUS
 coords                Coordinates
 mem                   Show memory
 version               Game version
 framerate             Frame rate
 polys                 # of polygones
 endcredit             Credits
 toto                  Machine gun
 deriver               Walk through walls

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 Eastereggs:

 If you let Indy use the chalk on any wall he begins to draw pics of
 other LucasArts characters.

 If you play as Guybrush Threepwood in the Monkey Island scene you are
 shooting with ducks instead of rockets wehen using the bazooka.