Cheatcodes:

During game enter one of the following:

mpkfa -- Invincibility. 
mpbodyguard -- No Damage. 
mphighlander -- 99 lifes. 
mpshoes -- 99 souls. 
mpthewolf -- Jump to next level. 
mpbadmofo -- Jump to previous level. 
mpbringthegimp -- Go to "boss area". 
mppetrol -- More energy. 
mparmorall -- More armor. 
mpglovebox -- Weapons. 
mpignition -- Keys. 
mpturbocharger -- "Scrolls". 
mpironpockets -- Prevents thiefs from stealing from you. 
mpbandaid -- Energy field will never run dry. 
mppos -- Shows coordinates. 
mpfps -- Shows frame rate. 
mplockpick -- Gives "skull key". 
mpomar -- Gives "fire shield artifact". 
mptroadrunner -- Gives "speed boost artifact". 
mpwinturbo -- Gives "super scroll artifact". 
mpbadbreath -- Gives "Freak artifact". 
mpmintybeath -- Gives "Worship artifact".