Blood Cheats
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Press "T" while playing and enter these codes: 

i wanna be like kevin = Invincibility 
mpkfa = Invincibility 
capinmyass = Invincibility 
nocapinmyass = Disable invincibility if enabled with capinmyass 
voorhees = Short invincibility 
cousteau = 200 health 
spork = 200 health 
bunz = Full weapons, ammo, and dual weapons 
hongkong = Full weapons and unlimited ammo 
lara croft = Full weapons and unlimited ammo 
idaho = Full weapons and ammo 
tequila = Dual weapons 
onering = Invisibility 
griswold = Full armor 
montana = All inventory items 
satchel = All inventory items 
keymaster = All keys 
goonies = Reveal entire map 
calgon = Warp level 
mario = Warp level 
spielberg = Warp level 
eva galli = No clipping toggle 
funky shoes = Superjump 
jojo = Surreal mode 
sterno = Fades in from black screen 
rate = Display framerate 
fork broussard = No ammo or weapons, 1 health, and surreal mode 
edmark = Hurt yourself 
kevorkian = Kill yourself 
krueger = Self immolation 
mcgee = Self immolation