While playing, type WW2BLOOD.
We don't know how it works, but to enable debug mode type WW2DEBUG while playing.
Type WW2RATE while playing to display the game's framerate.
While playing, type WW2GOD.
To skip to the next level, type WW2LEVEL while playing.
To reveal the entire map, type WW2SHOWMAP while playing.
To walk through walls and other objects, type WW2CLIP while playing.