difficulty settings

Whenever i build a level, i tend to design it for the "hurt me plenty" difficulty setting and then do the other ones later, but what do you reckon is the best way to make a level more difficult
Putting in more monsters or less ammo and health?

(apologies for the grammar)

A little bit of it all...

Cut some of the health, cut some of the ammo, bring in more monsters!

Thats what i did!

Use TCount and then add more monsters to the recomended number.