Master of Magic

Cast all learnable spells:
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Hold [Alt] and type pwr or power at the magic screen.
All wizards (including opponents) will be able to gain
mana and cast all learnable spells, including the Spell
Of Mastery. 

Full map:
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Hold [Alt] and type rvl or reveal at the magic screen.
Exit the magic screen, then re-enter the magic screen
to enable the code. Note: This also affects opponents.

Microprose message:
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Hold [Alt] and type destin at the magic screen to display
a message to send Microprose a copy of the saved game and
a bug report.