Run  the game by typing WOLF3D -NEXT and when the game starts and
you  are  in  the prison cell press and hold down [Tab]+[Enter]+[Ctrl]
and the following keys can be used. Hold down [Tab] while pressing the
appropriate key:

Key:  Effect:
W     Warp up a level
E     Completes the level you are on
I     Gives you free items such as better weapons. More ammo. 
      50% better health.
G     Turns God mode on and off. With it on you are invincible.
S     Turns slow motion on and off
C     Gives information about the current level
F     Shows co-ordinates of the current location
B     Changes border colour
N     Enables you to walk through walls.