Blood & Magic [cheats] Level Select 
When you're at the select level screen hold down the Alt-key and press the A button, now you'll have access to all of the levels

Research all of the Creatures 
While playing hold down the Alt-key and type in "Elminster". Now you will have research on all of the creatures. 
-from boland

Get 300 Mana Points 
Hold the ALT key and type BOOST 


Summon Codes 
Hold the ALT key and type:

FATHER Cleric 
WOLVERINE Druid 
GREMLIN Enchanter 
FATAL ATTRACTION Fury 
FLYING MONKIES Gargoyle 
RAISE DEAD Ghoul 
ALASKA Gnome 
JARETH Goblin 
MERV Griffin 
BODY GUARD Guardian 
MOTHER IN LAW Harpy 
MICROSQUISH Juggernaut 
SEDUCTION Nymph 
LANCELOT Paladin 
YOGI Ranger 
CONCRETE Stone Golem 
MERLIN Wizard 
SHADOW Wraith 
SMOG Wyrm 
DEAD FLESH Zombie