Dungeon Master 1

Cheat Codes:
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Go to the dungeon entrance and face the door. Cast the spell
OH EW RA. You will see someone interesting.

To advance ninjas a level, stand in a hall and throw your
weapons. Then get them, and repeat. This also works with magic
and fighter levels. Cast a spell at the air, or slash and bash
until you gain a level.

Also, to make your character advance levels, simply attack thin
air.