Go to the options menu in the game and turn on the console mode. During gameplay bring up the console ~ and put in one of the following codes

wuss - Get all weapons

health 100 - Max out health

notarget - Be invisible

god - Invincibility

noclip - No clipping mode

fps 0 or fps 1 - Toggle frame rate display

give all - Get Weapons & ammo

cg_cameradist -45 - Get Close view

cg_cameradist 128 - Regular view

map - Substitute a map name below for to go to that map

centipede1
centipede2
facade
fortress1
fortress2
funhouse
garden1
garden2
garden3
garden4
grounds1
grounds2
gvillage
hedge1
hedge2
hedge3
jlair1
jlair2
keep
pandemonium
potears1
potears2
potears3
qlair
rchess
skool1
skool2
tower1
tower2
tower3
utemple
wchess1
wchess2
wforest

give - Get item use list below

w_knife.tik
w_cards.tik
w_mallet.tik
w_jackbomb.tik
w_eyestaff.tik
w_icewand.tik
w_jacks.tik
w_blunderbuss.tik
w_demondice.tik (note: This command or give all must be used multiple times to get all three Demon Dice)
w_ragebox.tik