To enable the cheat mode, press L + Y + A and then enter the codes you see below:
PELOR - Invincibility
MPS LABS - Nightmare Difficulty
CREDITS - Show Credits
UNBUFF - NoCheats
OBADHAI - Unlimited MW
AUSTIN - 10 Rod of Destruction
BELL - 10 Thrown Daggers of Stunning
BILGER - 10 Tome of the Apprentice
BRATHWAI - 10 Thrown Hammer
BROPHY - 10 Fire Flask
CRAWLEY - Holy Water
DELUCIA - 10 Rod of Fire
DERISO - 10 Insect Plague
DINOLT - 10 Rod of Shadows
DSP633 - 10,000 Experience
EHOFF - 10 Firey Oil
ELSON - 10 Thuderstone
ESKO - 10 Fash Freeze
FRAZIER - 10 Thrown Viper Axe
GEE - 10 Large Will Potions
HOPPENST - 10 Warp Stones
HOWARD - 10 Thrown Viper Axe
JARMAN - 10 Rod of Miracles
KEIDEL - 10 Keys
KNE637 - 500,000 Gold
LU - 10 Medium Potions of Will
MEFFORD - 10 Tome of the Teacher
MILLER - 10 Rod of Missiles
MOREL - 10 Thrown Daggers
N_STINE - 10 Constitution Points
PAQUIN - 10 Tome of Lessons
PRASAD - 10 Thrown Halcyon Hammer
RAMERO - 10 Thrown Axe of Ruin
SMITH - 10 Pyrokins
SNODGRASS - 10 Keys
SPANBURG - 10 Tomes of the Master
SPINRAD - 10 Anitvenom
THOMAS - 10 Berserk Brew
THOMPSON - 10 Large Healing Potions
UHL - 10 Potions of Haste
WEBER - 10 Fire Bomb
WHITTAKE - 10 Rod of Reflection
WRIGHT - 10 Globe Potion
ZXE053 - 10 Dexterity Points