Cheat Mode:
Press Left Shift + F11 then type one one
the following:

Code         Result
TIMELESS     Alternate pause mode
MEDIC        Where is my mind ? (Hint display)
EPITAPH      Our last words (Victory condition display)
POWERMAN     I've got a big gun
SHOW ME ALL  show objects, elements, etc.
SCHNEIDER    Never have enought of these peanuts (abnormal program exit)
JACKAL       Do not waste these bullets
HOLLOW MAN   Invisibility
CLINT        You Win !! (skip level)