I was 7 when I started playing Blood, so as you might expect, I died a lot. These cheats were really helpful to help me get through the stages and check the whole story.
I used it so much at that time that I never forgot many of these cheats like lara croft, mpkfa, keymaster and EVA GALLI (reference to a great but underrated horror movie starring Fred Astaire btw).
Besides CALGON, the codes LUIGI and/or MARIO also work in order to skip levels.
This was my first FPS shooter ever and still is my favorite to this day.