Use the password 'EXTRAS', and during the game press [F1]-[DEL]-[F1] and you will have max of everything.
To enter a password you have to press SHIFT at the titlescreen after which an entry box appears.
The following passwords are for the stages:
NOSHJE (to Job 2)
SEQUEL (to Job 3)
TWITCH (to Job 4)
MARVEL (to Job 5)
GIBBET (to Job 6)
There are three extra passwords of which two should only be used as a last resort, and one only had a reason at the moment the game was being demoed.
PROTEC (Activate immortality)
EXTRAS (Additional cheats during game, see below for details)
OFF (The passwords are not visible after this. This was used to keep passwords a secret on fairs and meetings)
If password 'EXTRAS' is activated, these opportunities arise during the game:
[F1]: Add item 'protection tray'
[F2]: Add item 'shoes' (to jump higher)
[CLS]: Add a bomb (explosive).
[INSERT]: Add saliva
[DEL]: Add vitality.
More extras during paused game (press [STOP] to pause):
[LEFT] + number or letter: Go to according elevator door on the left.
[RIGHT] + number or letter: Go to according door on the right.
(A maximum of 16 elevator doors are on the left and 16 are on the right;
 is first elevator door, [F] the last one if it exists.
So with [RIGHT] + [A] you go to the 10th elevator door on the right)