Press "T", type the cheat and hit "ENTER".

MPWHEREAMI: displays map coordinates
MPBEEFCAKE: more power for the character you play (also more gore)
MPKILLEMALL: kills all monsters on a level
MPSPEEDUP: increases the speed rating of your character (from 1 
to 5)
MPSTRONGER: increases the strenght rating of your character 
(from 1 to 5)
MPBERETTA: get the Beretta
MPSUBMACHINEGUN: get the submachinegun
MPFLAREGUN: get the flaregun
MPSHOTGUN: get the shotgun
MPSNIPERRIFLE: get the sniper rifle
MPHOWITZER: get the howitzer
MPNAPALMCANNON: get the napalm cannon
MPSINGULARITY: get the singularity generator
MPASSAULTRIFLE: get the M16/MP5 assault rifle
MPBUGBUSTER: get the bug buster spray can
MPMINIGUN: get the super chaingun
MPLASERRIFLE: get the ricocheting laser rifle
MPTESLACANNON: get the Tesla cannon
MPVOODOO: get the voodoo doll (if you simply hold it motionless 
for 30 seconds, it talks)
MPTHEORB: get the Orb
MPLIFELEECH: get the life leech (if you simply hold it 
motionless for 30 seconds, it talks)
MPGOSHOPPING: get all items
MPNICENURSE: +25 health
MPREALLYNICENURSE: +300 health
MPWARD: get 25% armor
MPNECROWARD: get +100 armor
MPCARBONFIBER: get the Willpower power up (95% invulnerable)
MPTAKEOFFSHOES: get the Stealth powerup (30 seconds of invisibility)
MPHERKERMUR: get the Anger powerup (30 seconds of 
triple damage)
MPBEANSOFCOOLNESS: get assorted weapons
MPFOLLOWME: play in 3rd-person mode (only works after you've 
upgraded to v.1.1)

          You can warp from map to map by pulling down the 
console and typing in the 
long name of the map you want. The easier way to do this is as follows:
      In your Windows START menu, go to SETTINGS, then 
TASKBAR, then START MENU
and finally ADVANCED. Highlight the BLOOD 2 icon, go into FILE, 
then to PROPERTIES,
then to the SHORTCUT tab.The "Target" line should read 
something like
"C:\Monolith\Blood2.exe" (or wherever you've installed 
the game). To this line add a space
and then type 
              +enableretaillevels 1
     Now when you start the game, go to SINGLE PLAYER and then 
to CUSTOM LEVEL --
all of the game's maps (single- and multi-player) will be 
listed. Pick the one you want and
off you go.

         You might be able to improve your framerate by pulling 
down the console and typing
TRIPLEBUFFER 1, but remember to save often to relieve the game 
engine's memory. Also,
the more debris there is on a level (shattered furniture, 
trashcans, etc), the harder the engine
works and the lousier your framerate. If things start to get too 
choppy after a particularly
energetic session of prop demolition, simply save your game 
(QuickSave = F5) and then
reload it (QuickLoad = F6). When you finally reappear on the map 
(load times can be a bit
long), all the debris will have disappeared and your framerates 
should be much improved.